This is Future Fight tier list. All uniforms are listed for beginners. If you click portraits you can see details of the characters.
Recentely added characters are marked as “NEW”
Super villain-type character : border color red.
Roughly I can say that
Tier S: can be used in WBU and any floor in Shadowland
Tier A: can be used 15F ~ 30F Shadowland
Tier B: can be used 1F~15F Shadowland
Tier C: Not recommended