Rusty Sprinkler

Rusty Sprinkler is a boy who Pubertina had a crush on in  the episode with the same name.

Rusty Sprinkler
Rusty is shown to be a pardory of Justin Beiber and is shown to be self-centered. He does, however, show a little kindness to Pubertina.

Deb's Obsession Part 2
Pubertina asked her fake friend, Rebecca, what her favorite Rusty Sprinkler song was, implying that despite her love for Andrew and Devin Nitley she still loves Rusty.

Trivia

 * Rusty Sprinkler is the first character to have their last name revealed. The second was Colonel Flunkerton, the third was Reverend Boyle, the fourth was Barry Blumpkin, the fifth was Devin Nitley, the sixth was Vince McMatterson and the seventh was Lil Wayne.