Billy and Bobby Bittles

Billy Biddles and Bobby are preschoolers that made their first appearance in the episode "So Long, Spanky". It is unclear which is Billy and which is Bobby.

They even tried putting a spider on D.W. only for the spider to be eaten by the toad that was hiding in D.W.'s backpack, which caused the pranksters to flee in fear.

Billy is a vegetarian.

They appeared again in the episode Arthur's Almost Live Not Real Music Festival as part of the chorus that was singing the Library Card Song.

One of them also appeared in the episode Arthur's Lost Library Book. In the episode he was in the library with D.W., Edwin, and Unknown Female Aardvark while Mr. Ratburn did a puppet show for them.

Physical appearance
Billy and Bobby are both bears with a tan and light gray complexion, though one has a round head like the Tibbles while the other has a more rectangular head. One of them wears a purple shirt with a single yellow stripe, short tanned khakis, cream colored socks, and brown shoes. The other wears a green shirt, blue overalls over his green shirt, cream colored socks, and brown shoes. Both twins have some hair on their heads.

Trivia

 * Even though these two characters have not appeared since Season 3, it's very possible that they have been "reincarnated" into Liam and Unknown Male Bear.

Appearances

 * So Long, Spanky
 * Finders Key-pers
 * How the Cookie Crumbles
 * Arthur's Lost Library Book
 * Arthur's Almost Live Not Real Music Festival (cameo)