Killer Croc/Arkham

Good With

 * Any Arkham character. Harley Quinn/Arkham Knight passive will give also boost for Killer Croc, by permanently swaping characters. The third character can be any other character from Arkham series(is recomended Batman, Arkham Knight or Bane).

Good Against

 * Any character which have very powerfull or unblockable special attacks, like Killer Frost/Prime or Superman/Godfall.

Countered By

 * Any character which deal critical damage. Armor works like additional health(like with Astro Force(gear) after full life drain).

Trivia

 * He is the first character to be unlocked by something other than packs, challenges, or online rewards. (Unlocked bonus battle 8)
 * He is the fifth mobile-exclusive character, after Darkseid, Static, The Arkham Knight and Deadshot.
 * He is the fourth character to lack a Prime variant, after Scorpion, The Arkham Knight and Deadshot.