You don't understand the purpose of this show.
It's not called Twenty Faces the Mysterious Theif. It's called Daugher of Twenty Faces.
He was holding her back from her rightful place as main character. The longer he stayed, the more we had to deal with puppy love Chico.
Do we want cute puppy love Chico? Fuck no! We want badass slightly emo Chico from the OP