Alien Anatomy – The character has the form and/or characteristics of an alien.
Ben 10 (Cartoon Network) can mimic the powers of several aliens but one by one (Ben 10 #1).
Kevin Levin, a major character in Ben 10, becomes an amalgam alien in Kevin’s Mutations/Ben 10: Omniverse.
Xenocytes can bond with hosts and create DNAliens (Ben 10).
Rus Livingston has merged with an alien parasite (The Official Handbook of the Invincible Universe #2, Image).
In Transmetropolitan (Vertigo) by Warren Ellis, humans inject alien DNA into their systems to become aliens (Transmetropolitan #2)!
Ultra the Multi-Alien (DC) is the first amalgam alien! Ultra the Multi-Alien is kind of aliens meet Frankenstein. Ultra is composed of body parts of four different aliens (Mystery in Space V1 #103)!
Alien mimicry was all over the place during the DC Silver Age (Action Comics V1 #239, Adventure Comics V1 #270, Aquaman V1 #16, Batman V1 #140, Blackhawk V1 #177, Detective Comics V1 #251, Jimmy Olsen V1 #32, Tales of the Unexpected V1 #76-1, World’s Finest V1 #105).