...

It's a tie between Maraas and Teddie

Alice is delusional at times and often lies to herself more than other people

And Balthier

well

pirate

He can't help it, it's his job X3

Though he doesn't have much pirating to do in the underworld so he has no reason to be an underhanded bastard to others there

it is. he'll just have to turn his scheming against themis

though I think he's scared he'd be taking up his father's war