Which character is D.J. Tanner's best friend and next-door neighbor?

Kimmy Gibbler is D.J. Tanner’s best friend and next-door neighbor.

Kimmy and D.J. have known each other since the Gibbler family moved next door to the Tanners. Their friendship is a recurring part of Full House, even though Kimmy’s loud, eccentric behavior frequently annoys the Tanner family—especially Danny, Stephanie, and Jesse.

Kimmy was initially a recurring character, played by Andrea Barber, before becoming a series regular in the show’s fifth season. Her friendship with D.J. survives arguments, temporary fallouts, and major changes as the girls move from childhood into high school.

A common mix-up is treating Kimmy as one of the Tanner sisters. She is not related to D.J.; she is the family’s neighbor and D.J.’s longtime best friend. Kimmy later returns as a major character in Fuller House, where she becomes part of the extended Tanner household and has a daughter, Ramona.