Skill Investment

Here's the explanation for all the numbers and colors used in the guide:

10/5/7 means upgrading Skill 1 to lvl 10, Skill 2 to lvl 5, and Burst Skill to lvl 7,
Yellow means the immediate investment when u get the unit. There are 3 reasons for this:

If the unit is Meta or High Priority, it will have a starting investment of more than 1/1/1 (such as 4/4/4) depending on what the unit provides.
If the unit is Medium or Low Priority, 1/1/1 will be mentioned, meaning no immediate investment is required, and you can invest in this character if you need to use it according to the priority listed.
If we deem that a unit does not have usable skills to be meta for any gamemode, no investment will be mentioned.

Blue means minimum investment to take advantage of the Nikke's skills. There are 2 reasons for this:

Sometimes, minimum investments are breakpoints such as for Noir or SAnis.
Sometimes, minimum investments are just the ideal way to progress to upgrade that unit, before moving on to Recommended and High.

Red means recommended investment for F2P players,
Purple means maximum recommended investment, in order to get the best out of the unit. You should only try to reach these investments if you have a surplus of Skill Books leftover.

More info:

The skill investment list below features a lot of Level 4 and 7 because they are easier to understand. Any higher levels will cost a new type of resource.
However, you may choose to upgrade to Level 5 if you need a stronger effect instead of 4, as the increase in Blue Manual cost from Level 4 to 5 is still low. The leap only starts from Level 6 onward.
There is also a leap from Level 3 to 4, so if you want to save a tiny bit of Blue Manuals, then leave at 3 instead of 4.

Priority explained:

Meta: Most Important Nikkes.
High: Good in various PvE content.
Medium: Good in at least one PvE content.
Low: Can perform well but not as good as other units / Situationally Meta / Old Meta
Very Low: Niche usage / Tribe Tower Units
Late Game: These nikkes need investments to reach their potential but are expensive to build. They should be invested after clearing Ch 23 Normal with mentioned priority.
PvP: These units are more used for PvP.

Sorting:

Name

Priority

PVE investment

1/1/1 → 4/7/7 → 7/10/10 (→ 10/10/10)

PVP investment

1/1/1 → 4/7/7 → 4/10/10 (→ 7/10/10)

Priority

Low (Boss)

PVE investment

1/1/1 → 4/4/4 → 7/7/7 (→ 10/10/10)

PVP investment

1/1/1 → 4/1/4 → 7/4/7 (→ 10/4/10)

Priority

Low

Ada Wong

PVE investment

4/4/4 → 10/4/4 → 10/10/7 (→ 10/10/10)

PVP investment

4/4/4 → 10/4/4 → 10/10/7 (→ 10/10/10)

Priority

Medium (Boss)

Ade

PVE investment

1/1/1 → 1/5/1

PVP investment

1/1/1

Priority

Very Low

Ade: Agent Bunny

PVE investment

4/4/4 → 4/4/7 → 7/7/10 (→ 10/10/10)

PVP investment

4/4/4 → 4/4/10

Priority

High

Admi

PVE investment

1/1/1 → 1/1/5

PVP investment

1/1/1

Priority

Alice

PVE investment

1/1/1 → 10/4/10

PVP investment

1/1/1 → 10/4/10

Priority

Medium

Alice: Wonderland Bunny

PVE investment

1/1/1 → 4/4/4 → 7/7/4 (→ 7/10/4)

PVP investment

1/1/1 → 4/4/4

Priority

Low (Boss)

Anchor

PVE investment

1/1/1

PVP investment

1/1/1

Priority

Anchor: Innocent Maid

PVE investment

1/1/1 → 4/7/4 → 7/10/7 (→ 10/10/10)

PVP investment

1/1/1 → 4/4/4 → 7/7/7 (→ 10/10/10)

Priority

Medium

Anis

PVE investment

1/1/1 → 4/4/4

PVP investment

1/1/1 (→ 4/4/4)

Priority

Low (PvP)

Helm: Aquamarine

PVE investment

1/1/1 → 4/7/4 → 4/10/4

PVP investment

1/1/1

Priority

Medium (Boss)

Arcana

PVE investment

4/4/4 → 7/7/4 → 10/10/4 (→ 10/10/10)

PVP investment

4/4/4

Priority

Medium (Boss)

Aria

PVE investment

1/1/1

PVP investment

1/1/1

Priority

Asuka Shikinami Langley

PVE investment

1/1/1 → 4/4/7 → 7/7/7 (→ 10/10/10)

PVP investment

1/1/1 → 4/4/7

Priority

Medium (Boss)

Asuka Shikinami Langley: Wille

PVE investment

1/1/1 → 7/4/4 → 10/7/7 (→ 10/10/10)

PVP investment

1/1/1

Priority

High

Bay

PVE investment

1/1/1 → 4/4/4

PVP investment

1/1/1 → 4/4/4

Priority

Low (PvP)

Mary: Bay Goddess

PVE investment

1/1/1 → 4/4/4

PVP investment

1/1/1

Priority

Low (Boss)

Bay (Treasure)

PVE investment

1/1/1 → 4/4/4

PVP investment

1/1/1 → 4/4/4 → 7/4/4

Priority

Medium (PvP Meta)

Belorta

PVE investment

1/1/1

PVP investment

1/1/1

Priority

Biscuit

PVE investment

1/1/1 → 4/4/4 → 4/4/7 (→ 4/4/10)

PVP investment

1/1/1 → 4/4/4 → 4/4/7 (→ 4/4/10)

Priority

Medium (PvP Meta)

Blanc

PVE investment

1/1/4 → 4/4/7 → 4/4/10

PVP investment

1/1/4 → 4/4/7 → 4/4/10

Priority

Medium

Neon: Blue Ocean

PVE investment

1/1/1

PVP investment

1/1/1

Priority

Bready

PVE investment

1/1/1 → 4/4/4 → 7/7/7 (→ 10/10/10)

PVP investment

1/1/1

Priority

Medium (Boss)

Brid

PVE investment

1/1/1

PVP investment

1/1/1

Priority

Centi

PVE investment

1/1/1 → 4/4/4

PVP investment

1/1/1 → 4/4/4

Priority

Low (PvP)

Cinderella

PVE investment

4/4/4 → 7/4/7 → 10/7/10 (→ 10/10/10)

PVP investment

4/4/4 → 7/4/7 → 10/4/10 (→ 10/7/10)

Priority

Meta

Claire Redfield

PVE investment

1/1/1

PVP investment

1/1/1

Priority

Notes

You will never use her.

Clay

PVE investment

1/1/1 → 4/4/4 → 4/7/4 (→ 4/10/4)

PVP investment

1/1/1 → 4/4/4

Priority

Low (Boss)

Cocoa

PVE investment

1/1/1 → 4/4/4

PVP investment

1/1/1

Priority

Very Low

Crow

PVE investment

1/1/1

PVP investment

1/1/1

Priority

Crown

PVE investment

4/4/4 → 7/7/7 → 10/10/10

PVP investment

4/4/4 → 7/4/7 → 10/4/10

Priority

Meta

Notes

Skill 1 is her most important basic skill, not only because it gives a huge ATK buff, but also the reload is so lethal on Crown.

Crust

PVE investment

1/1/1 → 3/3/3 → 4/4/4 (→ 5/5/10)

PVP investment

1/1/1

Priority

Low (Boss)

PVE investment

1/1/1

PVP investment

1/1/1

Priority

D: Killer Wife

PVE investment

4/4/4 → 4/7/4 → 7/10/4 (→ 10/10/7)

PVP investment

4/4/4

Priority

Medium

Delta

PVE investment

1/1/1

PVP investment

1/1/1

Priority

Delta: Ninja Thief

PVE investment

1/1/1 → 4/1/1 → 7/1/1 (→ 10/3/4)

PVP investment

1/1/1 → 4/1/1 → 7/1/1 (→ 10/3/4)

Priority

Medium (PvP Meta)

Notes

S1 is the most important because it is the most valuable and works whether she is in-burst or off-burst. S2 is increased for higher healing or CP padding only. Burst is increased for CP padding or when you pair her with Distributed DMG dealers (but not worth it).

Diesel

PVE investment

1/1/1 → 4/4/4 (→ 4/10/4)

PVP investment

1/1/1

Priority

Very Low

Diesel (Treasure)

PVE investment

1/1/1 → 1/4/4 → 1/7/4 (→ 4/10/7)

PVP investment

1/1/1 → 1/4/4 → 1/7/4 (→ 4/10/7)

Priority

Very Low

Dolla

PVE investment

1/1/1 → 4/4/4 (→ 7/7/4)

PVP investment

1/1/1

Priority

Low (Boss)

Dorothy

PVE investment

4/4/4 → 7/4/7 → 10/4/10 (→ 10/7/10)

PVP investment

4/4/4

Priority

Low

Dorothy: Serendipity

PVE investment

4/4/4 → 7/7/7 → 7/10/10 (→ 10/10/10)

PVP investment

4/4/4 → 7/7/7 → 7/10/10 (→ 10/10/10)

Priority

Meta (Boss)

Drake

PVE investment

1/1/1 → 4/4/4

PVP investment

1/1/1 → 4/4/4

Priority

Low (Boss)

Drake (Treasure)

PVE investment

1/1/1 → 4/4/4 → 10/4/7 (→ 10/10/10)

PVP investment

1/1/1 → 4/4/4 → 10/4/7 (→ 10/10/10)

Priority

Medium (Boss)

Ein

PVE investment

1/1/1 → 4/4/4 → 7/7/7 (→ 10/10/10)

PVP investment

1/1/1 → 4/4/4 → 7/7/7 (→ 10/10/10)

Priority

Medium

Elegg

PVE investment

1/1/1 → 4/4/4 → 4/4/7 (→ 7/7/10)

PVP investment

1/1/1

Priority

Very Low

Elegg: Boom and Shock

PVE investment

1/1/1 → 7/4/4 → 10/7/7 (→ 10/10/10)

PVP investment

1/1/1

Priority

Medium (Boss)

Emilia

PVE investment

1/1/1 → 4/4/7 → 4/7/7 (→ 7/10/7)

PVP investment

1/1/1 → 4/4/7 → 4/7/7 (→ 7/10/10)

Priority

Medium (PvP Meta)

Emma

PVE investment

1/1/1

PVP investment

1/1/1 → 4/4/4 (→ 7/4/4)

Priority

Emma: Tactical Upgrade

PVE investment

4/4/4 → 7/7/7 → 7/10/10 (→ 10/10/10)

PVP investment

4/4/4

Priority

Medium (Boss)

Epinel

PVE investment

1/1/1 → 4/4/4

PVP investment

1/1/1

Priority

Very Low

Ether

PVE investment

1/1/1

PVP investment

1/1/1

Priority

Eunhwa

PVE investment

1/1/1

PVP investment

1/1/1

Priority

Eunhwa: Tactical Upgrade

PVE investment

1/1/1 → 4/7/7 → 7/10/10 (→ 10/10/10)

PVP investment

1/1/1 → 4/4/4 → 4/10/4 (→ 4/10/10)

Priority

Medium (Boss)

Eve

PVE investment

4/4/4 → 10/4/7 → 10/7/7 (→ 10/10/10)

PVP investment

4/4/4

Priority

Medium (Boss)

Exia

PVE investment

1/1/1

PVP investment

1/1/1

Priority

Exia (Treasure)

PVE investment

1/1/1 → 1/7/4 → 1/10/7 (→ 1/10/10)

PVP investment

1/1/1

Priority

Medium (Boss)

Flora

PVE investment

1/1/1 → 4/4/4 → 4/7/7

PVP investment

1/1/1

Priority

Folkwang

PVE investment

1/1/1

PVP investment

1/1/1

Priority

Frima

PVE investment

1/1/1

PVP investment

1/1/1

Priority

Frima (Treasure)

PVE investment

1/1/1 → 1/4/4 → 1/7/7 (→ 1/10/10)

PVP investment

1/1/1

Priority

Very Low

Grave

PVE investment

4/4/4 → 7/4/7 → 7/4/10 (→ 10/10/10)

PVP investment

4/4/4 → 4/4/7 → 4/4/10 (→ 4/7/10)

Priority

High

Guillotine

PVE investment

1/1/1 → 4/7/4 (→ 4/10/4)

PVP investment

1/1/1

Priority

Guillotine: Winter Slayer

PVE investment

1/1/1 → 4/4/4 → 7/7/7 (→ 10/10/10)

PVP investment

1/1/1 → 4/4/4 → 7/7/7 (→ 10/10/10)

Priority

Medium (Boss)

Guilty

PVE investment

1/1/1 → 7/1/1 (→ 10/4/4)

PVP investment

1/1/1

Priority

Low (Boss)

Harran

PVE investment

1/1/1 → 4/4/4

PVP investment

1/1/1 → 4/4/4 → 4/4/7 (→ 4/4/10)

Priority

Very Low

Helm

PVE investment

1/1/4 → 4/4/4 → 4/4/7 (→ 7/7/7)

PVP investment

1/1/4

Priority

Low

Helm (Treasure)

PVE investment

4/4/4 → 7/7/7 → 7/10/10 (→ 10/10/10)

PVP investment

4/4/4 → 7/4/4 → 10/7/7 (→ 10/10/10)

Priority

Meta

Himeno

PVE investment

1/1/1

PVP investment

1/1/1

Priority

iDoll Flower

PVE investment

1/1/1

PVP investment

1/1/1

Priority

iDoll Ocean

PVE investment

1/1/1

PVP investment

1/1/1

Priority

iDoll Sun

PVE investment

1/1/1

PVP investment

1/1/1

Priority

Snow White: Innocent Days

PVE investment

1/1/1 → 4/4/4

PVP investment

1/1/1

Priority

Very Low

Isabel

PVE investment

1/1/1 → 4/4/4 → 7/7/7 (→ 10/10/10)

PVP investment

1/1/1

Priority

Medium (Boss)

Jackal

PVE investment

1/1/1

PVP investment

1/1/1 → 4/4/4

Priority

Low (PvP)

Jill Valentine

PVE investment

1/1/1 → 4/4/4 → 7/7/7 (→ 10/10/10)

PVP investment

1/1/1 → 4/4/4 → 7/7/7 (→ 10/10/10)

Priority

Low

Notes

Not worth investing in because of her weak presence. Unless you are using her in Electric-weak SR, there is no reason for investing in her.

Julia

PVE investment

1/1/1

PVP investment

1/1/1

Priority

Julia (Treasure)

PVE investment

1/1/1 → 4/4/4 → 7/7/7 (→ 10/10/10)

PVP investment

1/1/1 → 4/4/4 → 7/7/7 (→ 10/10/10)

Priority

Low (Boss)

PVE investment

4/4/4 → 7/7/4 → 10/10/7 (→ 10/10/10)

PVP investment

4/4/4

Priority

Kilo

PVE investment

1/1/1 → 4/4/4 → 4/4/7

PVP investment

1/1/1 → 4/4/7 → 4/4/10

Priority

Laplace

PVE investment

1/1/1 → 4/4/4

PVP investment

1/1/1 → 4/4/4

Priority

Very Low

Laplace (Treasure)

PVE investment

1/1/1 → 4/4/7 → 4/7/10 (→ 4/10/10)

PVP investment

1/1/1 → 4/4/7 → 4/7/7 (→ 4/10/10)

Priority

Medium (PvP Meta)

Leona

PVE investment

1/1/1 → 4/7/4 → 7/7/7

PVP investment

1/1/1

Priority

Low (Boss)

Liberalio

PVE investment

1/1/1 → 4/4/4 → 7/7/7 (→ 10/10/10)

PVP investment

1/1/1 → 4/1/4 → 7/1/7 (→ 10/3/10)

Priority

Meta

Notes

Upgrade S1 for increasing nuke damage, preventing Liberalio from stealing her own Charge Speed buff, and for enabling SBS/un-OLed Alice. Upgrade S2 and Burst for a tremendous damage boost. S2 is useless in PvP.

Lily

PVE investment

1/1/1

PVP investment

1/1/1

Priority

Liter

PVE investment

4/4/4 → 7/4/7 → 7/4/10 (→ 10/4/10)

PVP investment

4/4/4 → 4/4/7 → 7/4/10 (→ 10/4/10)

Priority

Very High

Ludmilla

PVE investment

1/1/1 → 1/4/1

PVP investment

1/1/1 → 4/4/4

Priority

Ludmilla: Winter Owner

PVE investment

4/4/4 → 7/4/5 → 10/4/10 (→ 10/7/10)

PVP investment

4/4/4

Priority

Medium

Maiden

PVE investment

1/1/1

PVP investment

1/1/1 → 4/1/4 → 7/1/7 (→ 7/4/10)

Priority

Low (PvP)

Maiden: Ice Rose

PVE investment

4/7/4 → 4/10/4 → 7/10/10 (→ 10/10/10)

PVP investment

4/7/4 → 4/10/4 → 7/10/7 (→ 10/10/10)

Priority

High

Makima

PVE investment

1/1/1

PVP investment

1/1/1 → 4/4/4

Priority

Low (PvP)

Mana

PVE investment

1/1/1 → 4/4/4 → 7/7/7 (→ 10/10/10)

PVP investment

1/1/1 → 4/4/4 → 7/4/4 (→ 10/10/10)

Priority

Medium (Boss)

Marciana

PVE investment

4/4/1

PVP investment

4/4/1

Priority

Very Low

Mari Makinami Illustrious

PVE investment

4/4/4 → 4/4/7 → 7/7/10 (→ 10/10/10)

PVP investment

4/4/4 → 4/4/7 → 4/4/10

Priority

Medium

Mary

PVE investment

1/1/1

PVP investment

1/1/1

Priority

Mast

PVE investment

1/1/1 → 4/4/4 (→ 7/4/7)

PVP investment

1/1/1

Priority

Very Low

Mast: Romantic Maid

PVE investment

1/1/1 → 4/7/4 → 7/10/7 (→ 10/10/10)

PVP investment

1/1/1 → 4/1/1 → 7/1/1 (→ 10/1/1)

Priority

High

Maxwell

PVE investment

4/1/4 → 7/1/4 → 10/1/7 (→ 10/4/10)

PVP investment

4/1/4 → 7/4/4 (→ 10/4/4)

Priority

Medium (Boss)

Mica

PVE investment

1/1/1

PVP investment

1/1/1

Priority

Mica: Snow Buddy

PVE investment

1/1/1 → 4/4/4

PVP investment

1/1/1 → 4/4/4 (→ 4/10/7)

Priority

Very Low

Mihara

PVE investment

1/1/1

PVP investment

1/1/1

Priority

Mihara: Bonding Chain

PVE investment

1/1/1 → 5/5/5 → 7/7/7 (→ 10/10/10)

PVP investment

1/1/1 → 5/3/3 → 7/5/5 (→ 10/10/7)

Priority

Meta (Boss)

Milk

PVE investment

1/1/1

PVP investment

1/1/1

Priority

Milk: Blooming Bunny

PVE investment

4/4/4 → 4/7/7 → 10/10/10

PVP investment

4/4/4 → 4/4/10 → 4/10/10

Priority

Medium (Boss)

Milk (Treasure)

PVE investment

1/1/1 → 4/4/4 → 7/7/4

PVP investment

1/1/1 → 1/1/4 → 1/1/7

Priority

Anne: Miracle Fairy

PVE investment

1/1/1 → 4/4/4 (→ 4/4/7)

PVP investment

1/1/1 → 4/4/4 → 4/4/7 (→ 4/4/10)

Priority

Low (PvP)

Miranda

PVE investment

1/1/1 → 1/4/4 → 4/4/7 (→ 4/7/10)

PVP investment

1/1/1

Priority

Low (Boss)

Miranda (Treasure)

PVE investment

1/1/1 → 1/4/4 → 1/7/7 (→ 7/10/10)

PVP investment

1/1/1 → 1/4/4 → 1/7/7 (→ 1/10/10)

Priority

Medium (Boss)

Misato Katsuragi

PVE investment

1/1/1

PVP investment

1/1/1

Priority

Modernia

PVE investment

4/4/4 → 7/7/4 → 10/10/4

PVP investment

4/4/4

Priority

Medium (Boss)

Moran

PVE investment

1/1/1 → 4/4/4

PVP investment

1/1/1 → 4/4/4 → 4/7/7 (→ 4/7/10)

Priority

Medium (PvP Meta)

Mori

PVE investment

1/1/1 → 1/4/4

PVP investment

1/1/1

Priority

N102

PVE investment

1/1/1 → 1/1/4

PVP investment

1/1/1

Priority

Very Low

Naga

PVE investment

1/1/1 → 4/4/4 → 7/7/7 (→ 10/10/10)

PVP investment

1/1/1

Priority

Medium

Nayuta

PVE investment

4/4/4 → 7/4/7 → 10/5/10 (→ 10/10/10)

PVP investment

4/4/4 → 7/4/7 → 10/5/10 (→ 10/10/10)

Priority

Meta

Neon

PVE investment

1/1/1

PVP investment

1/1/1

Priority

Nero

PVE investment

1/1/1

PVP investment

1/1/1 → 4/4/4 (→ 10/10/4)

Priority

Medium (PvP Meta)

Neve

PVE investment

1/1/1 → 1/4/1

PVP investment

1/1/1

Priority

Very Low

Nihilister

PVE investment

1/1/1 → 4/4/4

PVP investment

1/1/1 → 4/4/4

Priority

Very Low

Noah

PVE investment

1/1/1 → 4/4/4

PVP investment

1/1/1 → 4/4/4

Priority

Medium (PvP Meta)

Noir

PVE investment

1/1/1 → 7/5/4 → 10/9/4 (→ 10/10/4)

PVP investment

1/1/1 → 7/5/4 (→ 10/5/4)

Priority

Medium

Noise

PVE investment

1/4/4 → 4/4/4

PVP investment

1/4/4 → 4/4/7 (→ 7/7/10)

Priority

Medium (PvP Meta)

Novel

PVE investment

1/1/1 → 1/1/7 (→ 4/4/10)

PVP investment

1/1/1

Priority

Very Low

Pascal

PVE investment

1/1/1

PVP investment

1/1/1 (→ 4/4/4)

Priority

Pepper

PVE investment

1/1/1 → 4/4/4

PVP investment

1/1/1 → 4/4/4 → 4/4/7 (→ 4/4/10)

Priority

Very Low

Phantom

PVE investment

1/1/1 → 4/4/4 → 7/7/4 (→ 10/10/7)

PVP investment

1/1/1 → 1/7/7 → 1/10/10

Priority

Low (Boss)

Poli

PVE investment

1/1/4 → 4/4/4 → 4/4/7 (→ 4/4/10)

PVP investment

1/1/4 → 4/4/4 → 4/4/7 (→ 4/4/10)

Priority

Poli (Treasure)

PVE investment

1/1/1 → 4/4/4 → 4/4/7 (→ 4/4/10)

PVP investment

1/1/1 → 4/4/4 → 4/4/7 (→ 4/4/10)

Priority

Low (PvP)

Power

PVE investment

1/1/1

PVP investment

1/1/1 → 4/4/4 → 4/4/7 (→ 7/4/10)

Priority

Privaty

PVE investment

4/1/1 → 7/1/1 (→ 10/4/4)

PVP investment

4/1/1 → 7/7/4 (→ 7/10/4)

Priority

Low (Boss)

Privaty: Unkind Maid

PVE investment

1/1/4 → 4/4/4 → 7/7/4 (→ 10/10/7)

PVP investment

1/1/4 → 4/4/4 → 4/4/7 (→ 4/4/10)

Priority

Low (Boss)

Product 08

PVE investment

1/1/1

PVP investment

1/1/1

Priority

Product 12

PVE investment

1/1/1

PVP investment

1/1/1

Priority

Product 23

PVE investment

1/1/1

PVP investment

1/1/1

Priority

Quency

PVE investment

1/1/1 → 4/4/4

PVP investment

1/1/1

Priority

Very Low

Quency: Escape Queen

PVE investment

4/4/4 → 4/7/7 → 7/10/8 (→ 10/10/10)

PVP investment

4/4/4 → 7/7/7 → 10/10/10

Priority

Medium (Boss)

Quiry

PVE investment

1/1/1

PVP investment

1/1/1 → 4/4/7 (→ 7/10/7)

Priority

Low (PvP)

Ram

PVE investment

1/1/1

PVP investment

1/1/1

Priority

Rapi

PVE investment

1/1/1 → 3/3/3

PVP investment

1/1/1

Priority

Very Low

Rapi: Red Hood

PVE investment

4/4/4 → 7/7/7 → 10/10/10

PVP investment

4/4/4 → 4/4/4 → 7/7/7 (→ 10/10/10)

Priority

Meta

Notes

Rapi scales well with investments and is worth instant 10/10/10. There are no actual breakpoints, all skills are important.

Rapunzel

PVE investment

1/1/1 → 4/4/4

PVP investment

1/1/1 → 4/4/4 (→ 7/4/4)

Priority

Medium (PvP Meta)

Rapunzel: Pure Grace

PVE investment

1/1/1 → 4/4/4

PVP investment

1/1/1

Priority

Raven

PVE investment

4/4/4 → 7/4/4 → 10/7/7 (→ 10/10/10)

PVP investment

4/4/4 (→ 10/4/10)

Priority

Meta (Boss)

Notes

Raven’s main use will be in UR and SR, which have bloated stats, especially in UR Hard Mode. This means Raven will need to be well invested skill-wise to be able to deal good damage versus them. Raven’s S1 plays a pivotal role on how much damage she deals.

Red Hood

PVE investment

4/4/4 → 7/7/7 → 10/10/10

PVP investment

4/4/4 → 7/7/7 → 10/10/10

Priority

Very High

Rei

PVE investment

1/1/1

PVP investment

1/1/1

Priority

Rei Ayanami

PVE investment

4/4/7 → 7/7/7 → 7/10/10 (→ 10/10/10)

PVP investment

4/4/7 → 4/7/10

Priority

Medium (Boss)

Rei Ayanami (Tentative Name)

PVE investment

1/1/1 → 7/4/4 → 10/7/7 (→ 10/10/10)

PVP investment

1/1/1 → 4/4/7 → 7/4/10 (→ 10/7/10)

Priority

Medium (Boss)

Rem

PVE investment

4/4/4 → 7/4/4 → 10/4/7 (→ 10/7/10)

PVP investment

4/4/4

Priority

Low (Boss)

Rosanna

PVE investment

1/1/1

PVP investment

1/1/1 → 4/1/1 → 4/7/7 (→ 7/10/10)

Priority

Medium (PvP Meta)

Rosanna: Chic Ocean

PVE investment

1/1/1 → 4/4/4 → 4/7/10 (→ 7/10/10)

PVP investment

1/1/1 → 1/1/7 → 1/4/10 (→ 1/7/10)

Priority

Medium (Boss)

Rouge

PVE investment

1/1/1 → 7/4/4 → 10/7/7 (→ 10/10/10)

PVP investment

1/1/1 → 4/4/4

Priority

High

Rumani

PVE investment

1/1/1 → 4/4/4

PVP investment

1/1/1 → 4/4/4

Priority

Low (PvP)

Rupee

PVE investment

1/1/1 → 4/4/4

PVP investment

1/1/1

Priority

Sakura

PVE investment

1/1/1 → 4/4/4 (→ 4/4/7)

PVP investment

1/1/1 → 4/4/4 (→ 4/4/7)

Priority

Very Low

Sakura: Bloom in Summer

PVE investment

1/1/1 → 4/4/4 → 5/7/7 (→ 7/10/10)

PVP investment

1/1/1 → 1/4/4 → 1/7/7 (→ 1/10/10)

Priority

Low (Boss)

Sakura Suzuhara

PVE investment

1/1/1 → 4/1/1

PVP investment

1/1/1

Priority

Scarlet

PVE investment

4/4/4 → 7/4/4 → 10/4/7 (→ 10/4/10)

PVP investment

4/4/4 → 7/4/7 → 10/7/10 (→ 10/10/10)

Priority

Medium

Scarlet: Black Shadow

PVE investment

4/4/4 → 7/4/7 → 10/7/10

PVP investment

4/4/4 → 7/4/7 → 10/7/10

Priority

Meta

Signal

PVE investment

1/1/1

PVP investment

1/1/1

Priority

Sin

PVE investment

1/1/1 (→ 4/4/4)

PVP investment

1/1/1

Priority

Little Mermaid (Siren)

PVE investment

4/4/4 → 7/4/4 → 10/7/7 (→ 10/10/10)

PVP investment

4/4/4 → 4/4/4 → 7/7/7 (→ 10/10/7)

Priority

Meta

Snow White

PVE investment

1/1/1 → 4/4/10 (→ 4/7/10)

PVP investment

1/1/1

Priority

Medium (Boss)

Soda

PVE investment

1/1/1

PVP investment

1/1/1 → 4/4/4

Priority

Low (PvP)

Soda: Twinkling Bunny

PVE investment

4/4/4 → 4/7/7 → 7/10/7 (→ 10/10/10)

PVP investment

4/4/4 → 7/4/7 → 7/4/10 (→ 7/10/10)

Priority

Medium (Boss)

Soldier EG

PVE investment

1/1/1

PVP investment

1/1/1

Priority

Soldier FA

PVE investment

1/1/1

PVP investment

1/1/1

Priority

Soldier OW

PVE investment

1/1/1

PVP investment

1/1/1

Priority

Soline

PVE investment

1/1/1

PVP investment

1/1/1

Priority

Sora

PVE investment

1/1/1 → 4/4/4 → 4/7/4 (→ 4/10/4)

PVP investment

1/1/1 → 4/4/4 → 4/1/7 (→ 7/1/10)

Priority

Anis: Sparkling Summer

PVE investment

4/4/5 → 7/7/9 → 10/10/9 (→ 10/10/10)

PVP investment

4/4/5 → 7/7/9 → 10/10/9

Priority

High

Sugar

PVE investment

1/1/1 → 1/5/5

PVP investment

1/1/1 → 4/5/5

Priority

Very Low

Tia

PVE investment

4/1/1 → 7/4/4 → 10/4/4

PVP investment

4/1/1 → 7/4/4 → 10/4/4

Priority

Medium

Tove

PVE investment

1/1/1 → 9/4/4 → 9/7/7 (→ 9/10/10)

PVP investment

1/1/1

Priority

Medium (Boss)

Tove (Treasure)

PVE investment

1/1/1 → 3/4/4 → 6/7/7 (→ 9/10/10)

PVP investment

1/1/1 → 3/4/4 → 6/7/7 (→ 9/10/10)

Priority

Medium (Boss)

Trina

PVE investment

1/1/1 → 4/4/4 → 4/7/7 (→ 4/10/10)

PVP investment

1/1/1 → 4/4/4 → 4/7/7 (→ 4/10/10)

Priority

Low

Trony

PVE investment

1/1/1 → 4/4/4 → 4/4/7 (→ 4/4/10)

PVP investment

1/1/1

Priority

Very Low

Vesti

PVE investment

1/1/1 → 4/4/4

PVP investment

1/1/1

Priority

Very Low

Vesti: Tactical Upgrade

PVE investment

1/1/1 → 4/7/7 → 7/10/10

PVP investment

1/1/1 → 4/7/7 → 7/10/10

Priority

Very High

Viper

PVE investment

1/1/1

PVP investment

1/1/1 (→ 4/4/4)

Priority

Low (PvP)

Viper (Treasure)

PVE investment

1/1/1 → 4/4/4 → 7/4/7 (→ 10/4/10)

PVP investment

1/1/1 → 4/4/4 → 7/4/7 (→ 10/4/10)

Priority

Low (Boss)

Volume

PVE investment

1/1/1 → 1/1/4 → 1/4/4 (→ 1/7/7)

PVP investment

1/1/1

Priority

Low (Boss)

Rupee: Winter Shopper

PVE investment

1/1/1

PVP investment

1/1/1

Priority

Yan

PVE investment

1/1/1

PVP investment

1/1/1

Priority

Yulha

PVE investment

1/1/1 → 1/4/1 → 1/7/1 (→ 1/10/1)

PVP investment

1/1/1

Priority

Low (Boss)

Yuni

PVE investment

1/1/1

PVP investment

1/1/1

Priority

Zwei

PVE investment

1/1/1 → 4/1/4 → 7/4/7 (→ 10/7/10)

PVP investment

1/1/1

Priority

Very Low

Chime

PVE investment

1/1/1 → 4/4/4 → 7/7/7 (→ 10/10/10)

PVP investment

1/1/1 → 1/1/1

Priority

Low (Boss)

Soline: Frost Ticket

PVE investment

1/1/1 → 4/1/1 → 8/1/1 (→ 10/4/1)

PVP investment

1/1/1 → 1/4/4 → 1/7/4 (→ 1/10/7)

Priority

Medium

Notes

Must upgrade S1 for PvE. S2 can be upgraded for PvE, but for PvP, upgrading is nearly compulsory because of its nature. Burst can be skipped for both PvE & PvP. We recommend checking the full review for this unit.

Diesel: Winter Sweets

PVE investment

4/4/4 → 4/7/7 → 7/10/10 (→ 10/10/10)

PVP investment

4/4/4 → 4/7/7 → 7/10/10 (→ 10/10/10)

Priority

Meta (Boss)

Notes

Prioritize S2 and Burst because they contribute to her (and her team’s) damage the most. Follow them up with S1. The value of S1 increases with each Crit Rate OL line and Crit Rate buffer in the team.

Brid: Silent Track

PVE investment

4/4/4 → 4/4/4 → 7/7/7 (→ 10/10/10)

PVP investment

4/4/4 → 7/4/7 → 10/7/10 (→ 10/10/10)

Priority

Medium (Boss)

Notes

Focus on S1 for supportive effects against Wind (Fire-weak); focus on S2 for personal damage and team damage against Fire-weak bosses; must upgrade Burst Skill if she is Bursting in any game content and against any element. While Burst Skill is most important, all of them are of similar priority, except if you are not against Fire-weak.

Skill Investment

How much you should invest into Skills on every character available in NIKKE.

Skill Investment

Glossary

Priority