Bubbler the Octopus is a large red octopus that appears in Diddy Kong Racing. He is known as one of the best racers on Timber's Island, and is located in Sherbet Island.
During the events of the game, Bubbler was brainwashed by the evil alien Wizpig into becoming one of his lieutenants, and entrusted with a portion of the Wizpig Amulet. Bubbler would only allow someone to race him if they managed to beat all the challenges in his area, Sherbet Island. Once Bubbler plays dirty in races, he would drop aquatic mines in an attempt to sink his opponent. Eventually, Bubbler was defeated. This defeat allowed Bubbler to fight off Wizpig's control long enough to allow his opponent to participate in the Silver Coin challenges.
After beating the Silver Coin challenges, the player is given the chance to have a rematch against Bubbler. This race is more challenging, as Bubbler now moves faster and drops destructive exploding bubbles. Once again, Bubbler is defeated and this time he breaks free of Wizpig's control permanently. As thanks for freeing him, Bubbler gives his opponent the piece of Wizpig's Amulet he was guarding. Oddly, Bubbler is the only character in the game not to appear in the cinematic ending.
Bubbler is also a boss in Diddy Kong Racing DS, where his voice sounds more menacing. Although he is relatively unchanged from the Nintendo 64 version, Bubbler is much harder to beat during the rematch than in the original game.