Gremlins: they should take cover behind blocks and obstacles when under fire from Knights. When idle, they could maybe chat with the nearest gremlin or fiddle with their weapons.
Wolvers: put tracking on the first bite. When idle, they could randomly bark to each other, growl at the nearest chromalisk, or perhaps playfully attack each other.
Chromalisks: when idle, if there are any slimes nearby, they will walk over to one and try to lick it.
Devilites: when idle, they could walk up to the nearest block and check it with a notepad in hand.