Skellis

Should you consider Ender the brawn of her family, then Skellis could be considered the brains. Some dragons may expect him to be brutish and wild, given how he's a Mirror and all, but that isn't the case at all.

A scholar at heart, Skellis a total bookworm. The Mirror carries around a small pair of golden reading glasses with him at all times, since his eyesight is naturally terrible -- and he soaks up sciences and teachings as if they were ambrosia. Skellis is actually the one who desperately tries to discourage Ender from picking fights, and does his best to steer his sister away from conflict, as he hates to be around any kind of fighting.

The Mirror has some issues with social awkwardness, too -- and he suffers from a terrible case of snort-laughter. Don't point it out, he's self-conscious!