>>112717061I like to imagine him as a sort of reluctant antagonist rather than a villain.
KND hijinks would bother Carl and he'd either try to avoid them or half ass a confrontation with them.
They'd smash his car, vandalize his property or swim in his pool and he'd try to get them to stop while also occasionally bothering them as well.
Once in a while they'd probably sort of team up to deal with a mutual problem.
So basically exactly like ATHF.
Also to deviate a little from the topic, I really like how the parents of the KND were kind, loving people, so It's not to unreasonable for me to imagine Carl as just a PO'd neighbor.