Diabeto is the morbidly obese son of Carter and Barbara Pewterschmidt's most recent maid in "Welcome Back, Carter".
When Lois tells Peter that her mom will get dinner ready, Peter knows that she'll just have her maid do it because she needs medicine for her overweight son. In a cutaway gag, Diabeto asks for a cookie, but is denied and told to roll himself back to the kitchen.
Diabeto is voiced by Seth Green.