R.R.R.

 (Romping Romp Romper), also known as R.R. (Romp Romper), is a powerful Bloon with 20,000 HP, and is one of Odd Music's elite minions, and is a miniboss in The Blizzard of Odd. It initially travels at 5x the speed of the Red Bloon, but it doesn't follow the path. Rather, it bounces around the screen, dealing 5HP damage to any tower it collides with. Its speed and damage increase by 1% for every 100HP damage taken.

Abilities

 * Bouncy Bouncy Pew Pew: Increases its speed and damage by 50% for 5 seconds, and shoots pellets at towers during this phase. These pellets deal 5HP damage to the first tower they hit and 2HP damage to the second tower, but can't pierce more than one tower.  The amount of projectiles increases as R.R.R. takes damage.
 * Bounce in Unison: Just like Odd Music's ability Bouncy Towers.

Trivia

 * It has an after-image effect while bouncing around. It gains more after-images as it travels faster, and can generate 2 after-images per frame when fast enough.