John

4th Grade Male Rabbit is an unnamed fourth grader who debuted in the episode Arthur's Eyes. Any information on this character is not known. He was in the same kindergarten class as Prunella, which was revealed in the episode Brain's Shocking Secret.

He has been seen in various places around school, but has made other appearances outside of the school.

Sometimes he is substituted for Steve, but appears to not be related to either Steve or Steve's younger sister Maria in any way, but is most likely friends with both of them. While his personality is a mystery he gets alone with the other kids.

Appearance
4th Grade Male Rabbit is a rabbit with a white complexion. He wears a tan collared shirt with long sleeves, dark cream colored khakis, has on very noticeable red suspenders, and cream colored shoes. He is bald.

He also wears rectangular lensed glasses just like Steve does and has a blue backpack. In the episode, The Blackout, his winter attire consists of a chestnut brown coat and a blue scarf. As a Kindergartner he wore a dark blue sweater, long gray jeans, and dark blue shoes. He also use to have hair as a Kindergartner, but had since had all his hair cut off.

Trivia

 * This character may have a little sister. His sister's name is Lisa.
 * Sometimes this character replaces Unknown Male Rabbit in some episodes like Cents-Less where he was seen in one scene and then the scene changed completely with a new character. He also replaces Steve at times in some episodes as in earlier episodes he was seen talking with Maria.
 * He is in the same fourth grade class as Prunella Deegan.