I love longsuffering best friend characters who prop up their more volatile and unhinged counterparts and anybody who ought to be the woobie but who's just too stable.

Alas, recs for this are always inherently spoilers, but I love plots that have presumed-dead characters popping up again, whether it's YuYu Hakusho style afterlife bureaucracy hijinks or secret agents with a bad habit of falling over cliffs at dramatic points in the plot. Also cheesiness. Lots of cheesiness.