Gabrielle received him as a Charmander from Professor Oak when she was starting her own Pokemon journey. She helped him evolve into a Charmeleon to a Charizard. He is somewhat of a target to Team Rocket who is determined to capture him for their boss.
Although he has a temper at times, Char is very loyal to his trainer and will never let her down. He tries his best to impress her and often protects her from danger. Overall he is a great Pokemon Gabrielle could possibly have.