This is a harder question than it seems. It's the "unconscious behavior or verbal habit" part that's tricksy. Uhm. Hmm.
That's not to say I have flawless characters because that'd be hecka boring. I've given my protags plenty of personal challenges to help with that whole "internal conflict" character-building requirement. Physical limitations abound with secondary characters, but those aren't tics or tells. Then there's the foisting on the enemy bit, which, some things in the hands of good people are inconvenient yet in the hands of bad people are disastrous for others.
See? Harder question than it seems. I think the winner of this one goes to:
Gurp the goblin from The Immortal Spy series has a flatulence problem, particularly when he's scared. It doesn't bother him, but those around him gift him with charcoal undies fairly frequently. While he's not the sort to wish ill upon most folk, he'd probably find it funny if an archangel developed a bad case of the flying farts.
