Mega Man Zero (series)

Mega Man Zero is a series of action-platformer games developed by Capcom, which center around the character of Zero, one of the playable characters from the Mega Man X series.

Mega Man Zero 2

One of the bosses in the game, Burble Hekelot, has the ability to grow larger due to eating robotic insects. He has four sizes - small, medium, large and very large. Once he reaches the very large size, he actually looks as if he's gaining weight, to the point of being unable to fit in his own metal panels, turning into a fat, rolling sphere.

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