to an extent you can actually say that luffy never recovered from sabo's death ... on top of ace's promise to not die before him ... which resulted in the massive breakdown after the war.

chopper literally joined a crew of monsters while worrying he'd be feared for being a monster. he's literally the least scariest of the crew HAHA even everyone who joined after has a scarier reputation; robin the devil, franky the cyborg, brook a fkn skeleton, jimbe warrior of the sea and fishman.