Joining
Pedantic Lad and
Lady Mondegreen (created by Gary McGath) in the Legion of Substitute Proofreaders, we find:
Its Girl, whose power should be thoroughly obvious, except for the fact that if she catches you putting an apostrophe in her name she "Hulks out". You wouldn't like her when she's angry.
There's a comic about a group of teenage heroes, the Legion of Super-Heroes. Each one has a different super power.
Then there's the characters who didn't manage to get into the Legion, but who banded together to help them out. They're the Legion of Substitute Heroes.