Pokémon X and Pokémon Y

Sadly none of them look like they'll be bulky in any sort of way, though their final forms remain to be seen.

Chespin will likely be quite bulky. It's based off a chestnut (with the spiky and hard outer shell) and a hedgehog, which obviously curls in a ball for defense. It definitely seems like the more defense focused starter. Fennekin is likely the special sweeper and Froakie is probably the speedy one.