Robolun can shoot bubbles, much like most Bubble Dragons. He can move much faster than the other three characters due to his robotic limbs, but he can not jump as high due to his metal body. He is the fastest character in the game.
Robolun appears as a playable character in Bubble Bobble Revolution. He sets out with Bub, Bob, and Lovelun to rescue their friends from Dreg's Castle. He is unlocked after beating Dreg's Castle once. He is faster than the other characters, but cannot jump as high.