Symbiotes

The Klyntar, colloquially and more commonly referred to as symbiotes, are a fictional species of extraterrestrial parasitic life forms appearing in American comic books published by Marvel Comics, most commonly in association with Spider-Man. The symbiotes, as their alternative name suggest, form a symbiotic bond with their hosts, through which a single entity is created. They are able to alter their hosts' personalities and/or memories by influencing their darkest desires, along with…Wikipedia