Mui

[2/15/2023 Update] Her S3 now can give up to 100% CR to herself if she crits at least 4 enemies.

Mui is more suited for PvP then she is for PvE. Both her skill 2 and 3 are AoE attacks that are great in certain PvP situations.

Her skill 3 is an AoE attack that can remove 2 buffs from enemies and give her all her allies a 3 turn attack buff + increase her own combat readiness by 25% per critical hit. Works great against enemies such as Maid Chloe, Fallen Cecilia etc. She will need 60% or higher effectiveness if you want to land the buff strips, especially as you climb higher in PvP.

Her skill 2 is an AoE attack that can apply 2 bleed stacks and also stun. This is a bit of RNG and can win you PvP matches if all stun lands. This can be easily countered by debuff cleansers though.

Her skill 1 is a bit random since the debuffs can be clutch in certain situations (such as landing attack down on DPS, defense break on tanks etc, silence on key targets etc.). However, most would prefer a debuff they know that fulfils a specific purpose.

She can be built as a speedy first turn unit with some survivability and effectiveness. This way, she can strip buffs and provide attack buff with skill 3. She can also be built with damage, but she will have to sacrifice health/defense for damage and speed.

For PvE, she is usable for Golem and Banshee, but there are better options such as Vivian, Charles etc.