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There are villains that want your stuff, villains that want you to do what they want, villains that want you dead. This guy(or gal) is nowhere near as wasteful. He wants what makes you you, and he wants it for himself.
When he beats you, he will take your abilities, your uniqueness, your everything and make them his own. He usually does this by literally absorbing or eating you. But more than that, the whole reason he is fighting you is to get this stuff. The more he gets, the stronger he gets. The stronger he gets, the more people he gets and he gains the attributes of anything he eats including firearms and If they happen to eat a sentient being they also gain the subject's memories and personality.
This Assimilation Superpower is the ability of a person, mutant, monster, demon, alien, Cosmic Abomination, etc; to absorb super powers from other characters by eating them. Sometimes this also allows the user to take the character's memories or physical appearance too.
As Characters in a story are a truly dangerous threat because they are often vicious, wild, feral, violent, and mindless eating machines that have little to no intelligence.
Unlike the other characters in the story, they are not even self aware.
They can become metallic from eating the metal around them. if they eat candy-armored they are far easier for him to dispatch.
1. The Assimilator is terrifying because of its virus-like ability to absorb people, body and mind, into itself, creating a threat that can spread faster than a Zombie Apocalypse. However, the Assimilator's voracious and indiscriminate appetite may lead to it eating someone who proves Too hard to control and assimilated a little too well and becomes the monster's primary consciousness.
2. Alternately, if they eat or steal another's powers, then their theft may go horribly right when the victim's Weakness is also stolen and allows enemies an easy way to defeat it. To make matters worse, the Assimilator probably has no idea that it inherited the weakness or how to minimize it or stop it being exploited.