Starla

Starla is an obese woman only featured in the episode Muscle Woman. She works at Icy & Hot Jewelry. She developed a crush on Mordecai and was the girlfriend of two other boys as it indicated with her lower back tattoo (she first dated Muscle Man, then Steve, then Muscle Man again, and then Mordecai before redating Muscle Man). When Mordecai broke up with her, she became extremely mad, destroying everything in her path like a fountain and a news reporter helicopter reporting on her as a "Crazed woman on a rampage." She may currently be back together with Muscle Man after he expressed his feelings towards her.

Trivia

 * Starla is the third female antagonist on Regular Show. The first one is Susan and the second one is Giant Susan.
 * She literally looks exactly like Muscle Man, except the fact that she is female.