“Sometimes having to run through obstacles in a temple is boring. But when opposites attract, it’s a great way to pass time. Water extinguishes fire, and sometimes fire evaporates water, yet Fireboy and Watergirl were able to look past those counteractions. Now that there’s more than just their mere existences threatening each other’s safety, maneuvering just won’t do the trick.”

Okay, Fireboy and Watergirl aren't exactly Newgrounds characters. They are, however, still important to flash history, especially to other sites that have their games. Not even they know why they're here, but they don't mind. Because they're always paired together in their games, they share the same slot. You can switch between each of them, but that's only if you need to stack up damage or slow down the opponent.