Three Course Meal Chewing Gum (Willy Wonka and the Chocolate Factory)
After Marge insulted his parents Harry (Harry Potter) lost control of his powers and caused her body to inflate.
Human Blimp (Dynomutt, Dog Wonder) creates a inflated ray gun that can inflate people, making them fat and float like blimps.
Fukurashiko (Dororon Enma-kun MeeraMera) can turn anyone he touches into balloon...
... and cause the victims to develop massive appetite.
Lubdan (Leprechaun series) can kill his victim by inflating particular body parts until they explode.
Buburina (Catnapped!) can turn anyone she touches...
...into floating balloons but her power doesn't work on humans.
Demon Beast Balloon Gamma (Madan Senki Ryukendo): a balloon Demon Beast, can shoot a beam that causes people to swell up like balloons and would've made them explode within an hour of their ballooning.
The Dominator Gun (Psycho-Pass) in the Lethal Eliminator mode fires an electromagnetic wave that cause victim to violently swell off at massive proportion and explodes.
Three Course Meal Chewing Gum (Willy Wonka and the Chocolate Factory) can cause eaters to inflate into a blueberry if they chew too much.
Balloon Ninja Gomubi-Ron (Ninpu Sentai Hurricaneger) can cause people to inflate like a balloon by force-feeding his victims his special sticky rice and using his magic to cause the stick rice to swell them up.
Cloverfield Parasites (Cloverfield) carry a toxin in their bite that can...
cause their victims to expand and violently explode.