I'm not 100% sure that Adrenaline should boost Defense... I feel like a rat-dude hopped up on panic would be easier to hurt, not harder.
Rat Swarm Control could probably mimic Ant-Man a bit more closely (just going with Rodent Heroes or something).
Maybe spin the Plague Immunity off into its own power? We're not hurting for space and it feels a bit weird tacked onto Rat Swarm Control.
Anyways, yeah, other than minor stuff like that he looks good to me.
Long overdue!