Alien Anatomy – The character has the form and/or characteristics of an alien. Aliens as aliens often have superpowers and could be listed here. Superman is an alien with vast superpowers due to his alien Kryptonian heritage. However, there are so many aliens in fiction that I prefer to focus on trans-alien examples. A trans-alien is not simply an alien but a human that has somehow acquired an alien form and/or characteristics.
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)!
Tharg’s Future Shocks – “The Mirror” – 2000 AD #666
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).