MODOK wins the thread. Truly the most unrealistic body type of them all.
Freegards
However, in my defense, I will say that he was originally named: Mental Organism Designed Only for Computing and he renamed himself MODOK after he took over AIM.
Unrealistic body type, check. But I've never been able to resist the un-PC mental image of MODOK that Peter Dinklage evokes, especially with the Tyrion Lannister haircut.