Avengers: Infinity War could possibly introduce a new villain besides Thanos and his henchmen as brand new film merchandise features a character that we haven’t seen before.
How either of them fit in Avengers: Infinity War narrative is anybody’s guess at this point (should they even be in the movie at all).
Thanos may be the main big bad of Infinity War, and considering that he has been built up to be this all-powerful villain, we expected that he can take Earth’s Mightiest Heroes all by himself.
Aesthetically, it resembles but doesn’t exactly look like quite a few Marvel creatures like Chitauri warlord, Warbinger, or foe-turned-ally, Ex Nihilo.