I love Levi because underneath his rude behavior is a sweet, caring guy. He was raised underground by a murderer so of course he's going to act like he does. But he cares alot for Eren and the others. He hates unnecessary death as much as he hates dirt ( which also might say be cus he lived underground which is filthy) Also, he tells funny jokes. No one gets them, but they're funny anyway. Hes...like that weird kid in school who tries to fit in by saying stuff he thinks is cool but it scares the other kids.
He wants to be fancy but he has no class. He wears cravats and suits, but then ruins the classy image by telling a vulgar poop joke.
Levi: a thug with a mouth of a sailor but a heart of gold.