The Percy Jackson Fandom would be that really dangerous kid who's always getting hurt and doing stunts and quests.

The Harry Potter Fandom would be sort of like the mom, keeping everybody in line.

Broadway Geeks would be the older but not oldest sibling that ignores everyone and always has headphones in.

The Doctor Who Fandom would be the weird younger child that believes in aliens and yells about numbers constantly.

The Sherlock Fandom would be the smart-aleck oldest sibling who loves annoying everyone.

Disney Geeks would be the really outgoing and funny middle child sibling, who's constantly goofing off and singing.

The Maze Runner Fandom would be the athlete in the family, probably a track runner.

The Artemis Fowl Fandom would be the robotics-obsessed younger sibling that still quietly believes in fairies.

Any more?