Sadly He became the children's fanservice character, faith that also is shared with other charafters.
The main cast is likely for that:
Children's fanservice: Chopper, Usopp
Pre-teen: Brook Luffy Franky
Teen: Sanji Zoro eventually
Bonus: Nami Robin
Every character is for the target audience, maybe Jimbo is the only without a simple classification.
Problem is that the more it goes and the wifer the cast, the more characters are stuck in their prototype, with chopper the worst offender