Mr. Bubbles is a Big Daddy who is Ada's protector.
Mr. Bubbles rescues the Rangers after they are attacked by a horde of possessed zombies and brings them to rapture. Mr. Bubbles is at first hostile towards the young rangers but calms down after they show a willingness to help Ada rescue other little sisters around Rapture. After finding enough fuel and tools to fix the malfunctioning dimensionator, Mr. Bubbles decides to help the Rangers.
Mr. Bubbles is very protective over Ada and will attempt to kill anyone with the intent on harming her or the other Rangers.
Trivia:
Mr. Bubbles's name is a reference to the Big Daddies.
Ada states she and Mr. Bubbles appeared on the PlayStation Allstars Battle Royale, making her and him the only Allstars not to be captured by Nefarious.
Ada and Mr. Bubbles are the only Allstars who are members of the Rangers.
