Chubby is my first hamster, actually they came in pair. Unfortunately, the partner died after a few month giving birth to 4 pups - 3 females and a male (died T_T).
He is very healthy and almost never bite (I got bitten only once because I tried to separate him from another male. I tried to mix him with another male hamster since i don't want to mix him with the female, and they got into a fight. but he is definitely fine if you mix him with another female =_="