Marauder

The Marauder is a demonic enemy in the upcoming game Doom Eternal that shares a suspiciously striking resemblance to the Doom Slayer.

Its only appearance is shown in a concept image which shows it wielding the super shotgun and some sort of Argent battleaxe. Its armor is very much like the Praetor Suit that the Doom Slayer wears, and it could point to a possible connection with the Doom Slayer.

Trivia
It bears some resemblance to Death Knight from First Quake.