Gum is a character from the Jet Set Radio series. She is a graffiti artist who is also a member of the GG's.
Sega Superstars Tennis
Gum is a playable character in Sega Superstars Tennis. She is unlocked during the last mission in Jet Set Radio mission planet, by winning the singles championship. Her design is taken from the original Jet Set Radio game. Gum's Superstar State releases the Tokyo-To's Police Force storm on the tennis court that charges at the other opponent(s).
In the DS version, Gum's Superstar State makes the ball, when it's hit, make a zig-zag form.
Sonic & All-Stars Racing Transformed
Gum is a playable character in Sonic & All-Stars Racing Transformed. She has a green and white car similar to Beat's. She leaves a trail of broken hearts behind her when she unleashes her All-Star move. In this game, she has got a new green tattoo on left leg, saying "Gum" in Japanese in reference to her original appearance in Jet Set Radio. She is unlocked for 105 stars in the World Tour.
Gum is the second Jet Set Radio character to appear in a Sonic spin-off game.
Gum and Pudding are the second characters of their game to appear alongside the main character of their game.
Her All-Star move in Sonic & All-Stars Racing Transformed could be a reference to the line "A real cool lady who leaves a trail of broken hearts", which is said by Professor K in the game Jet Set Radio Future.