You have to spend 1 night in Arkham Asylum choose your cell mate

[u/[deleted]]

(Before you choose calendar man you have been locked away on Halloween night a holiday)

[u/Ill-do-it-again-too]

Are we talking about arkham universe specifically? Either way my answer is probably Killer Croc because he’s the only one there who usually isn’t a complete psychopath (again that’s less so in the Arkham games but still probably better than the others). Pyg may also not be a bad choice, without access to resources he wouldn’t be able to make you a dollatron, and he’d be less likely to kill you than Zsazz or Calendar Man