Thanos

Thanos is an antagonist originating from Marvel's comic book franchises, serving as the main antagonist in Pony Avengers: Infinite Warfare.

History
Originally residing in the world the Avengers movies take place in, Thanos is later mistakenly transported to Equestria by Iron Man, and instantly decides to attempt to take Equestria over and halve its population. Eventually he manages to get ahold of the Elements of Harmony, but before he can insert them into his infinity gauntlet, the ponies and Ted Hanos show up and attempt to fight him, but don't manage to win. Things seem grim for a bit until Thanos, thinking it will make him stronger, downs a bucket of lead paint and dies of lead poisoning.

Personality
Unlike the film version of Thanos he is based off of, this Thanos has a much less serious and competent personality, seemingly more interested in doing everything in halves due to a personal obsession rather than concern over resources. He seems willing to do practically anything to fulfill his wants, including kidnapping or murder - though he does still have some care for his brother, Ted.