Dylan is a child with an unknown gender.
History[]
When Marge is driving to Dylan's birthday party with Bart, Lisa and Maggie as passengers, she claims that Bart and Dylan played together a lot when they were little, but Bart doesn't even remember who Dylan is--also, despite Marge's claim, neither she nor Bart even know if Dylan's a boy or a girl ("Dylan" is technically a unisex, although it is more common as a boy's name than a girl's name). The child's sex is never revealed and they invite both boys and girls to the party, and also seems to not like trucks.
Bart doesn't actually care for this matter and soon starts to play a Japanese card game called Battle Balls with other boys at the party.
Appearances[]
Episode – "Chief of Hearts" (Mentioned)