Possible Clues:

• "Family Matters" nerd
• 'Family Matters' nerd
• Classic TV nerd
• "Family Matters" misfit
• "Did I do that?" character
• "Family Matters" nerd Steve
• Jaleel White role
• 'Did I do that?' character
• 1990s sitcom character who had his own breakfast cereal
• "Did I do that?" TV nerd