They have a silly unserious kind of tone 

Pitch: Medium High

VOICE CLAIM: Nagisa from Assassination Classroom/Mahito from JJK/brett hand

Ciel is a cheeky asshole, and a criminal to top it off. They have stolen so much stuff they’ve lost count and have managed to get away each and every time. Hope's peak took them in knowing they were a criminal due to their knack for it and in hopes of improving them to better their title. Though Ciel can be an ass and annoying they surprisingly mean well and don’t have bad intentions.