This is their pet hamster/mascot, Peenee, who suffers no end of pain because of the kids' wild antics. I made a cartoon about him 2 years ago. Check it out here http://youtube.com/watch?v=IZWUriuGB40
Their transvestite neighbor. He's a weird guy, but a loyal friend to Ollie and Oly.
The last two at the bottom are newer designs of the kids. I might keep changing them, if I come up with some more ideas