Biological Manipulation (weight) – The ability to cause another to become fat and/or the character is an abnormal weight.
The Doctor (Wildstorm) punished his wife by making her hips heavier (The Authority V2 #9)!
DC Silver Age supervillains loved turning superheroes into fatties or there was the occasional super science mishap (Action Comics #283, Adventure Comics #345, Adventure Comics V1 #298, Adventure Comics V1 #330, Flash V1 #115, Jimmy Olsen V1 #49, Lois Lane V1 #5, Superman V1 #221)!
Superman was turned into a fatty one last time in the Bronze Age in 1977 in Action Comics V1 #477 (DC).
Some superheroes are naturally overweight.
Big Bertha (Marvel) is a superheroine (OHOTMU Master Edition #3).
Bouncing Boy (DC) is a superhero (DC Who’s Who V1 #3).
Faith (Valiant) is a superheroine (Faith #1).
Fat Fury (ACG) is a parody of a superhero (DC Who’s Who V1 #3).
The Blimp (DC) is a parody of a superhero.
Fatling – Creature Collection I