Hmmm, I don't think I fully understand you by the 'problem child' part, but, I'm guessing you mean like a character who causes trouble in the show (without meaning to)? Aha ^^
If so, then definitely Black Star from Soul Eater :D
posted over a year ago
great! yeah, any kind of young troublemaker will work.
Akito-san from Furuba,but for good reason (if there's such thing..) she's been through a lot with her mother and even being a female she was raised a male so she could be the head of the Sohma clan/family..there was just so much emotion in her childhood it's really sad..though Akito-san was portrayed as a male in the anime (as it seems..)..this is her past in manga..so hopefully this counts