Symbiotes

The Klyntar (colloquial: Symbiotes) are a fictional species of extraterrestrial symbiotes appearing in American comic books published by Marvel Comics, most commonly in association with Spider-Man. The symbiotes form a symbiotic bond with their hosts, through which a single entity is created. They also are able to slightly alter their hosts' personalities, and/or memories by influencing their darkest desires and wants, along with amplifying their physical and emotional traits and personality,…Wikipedia