I remember a game (I forget for which platforms, I think it was the Wii and stuff) that had you playing as a spider and a scorpion. As in, an actual spider... and an actual scorpion.
They didn't have any characterization. No dialogue. No thoughts. No narrator, IIRC. Just a spider going from one place to another, and a scorpion doing the same. And they would have boss fights with each other whenever they encountered each other.
That was a bad-ass game.