Unknown Male Rabbit

Unknown Male Rabbit is an unnamed character who appears in the show. Very little is known about him since his appearances are very brief in the episodes he appears.

He also has a sister and his parents have been seen throughout the series. He presumably has never spoken in any of the episodes and it's unknown if he or his sister go to Lakewood Elementary School or not.

Physical appearance
In his original appearance he had a gray complexion and wore green pants, a white shirt, had suspenders, long white socks, and blue and white sneakers. He has hair and fur just like his doppelgangers John and Steve.

In the episode "Cents-Less" he had a Windsor tan complexion and wore a white shirt, purple pants, white socks, and red and white sneakers.

In his most recent appearance he doesn't wear suspenders, but in both his original and recent appearances he wears glasses. In "Sue Ellen's Little Sister" he was seen with a purple camera. For his formal clothes he wore a blue shirt, long black pants, and blue shoes.

Trivia

 * This character looks very identical to Steve who also has a sister named Maria. Ironically Unknown Male Rabbit's Sister also looks identical to Maria, but has minor differences to Maria including skin complexion and clothes. He also bears a stronger resemblance to John. He also sometimes replaces either Steve or John in some episodes.
 * Since it's unknown what grade this character is in his age can't be determined at this time.
 * This character is one of the few doppelgangers that still reappears in the series.
 * He was silent, he never spoke again.