Phantom Thief of Hearts
We live in the Metal Gear timeline
Then what's this?He works alone basically... For now until he feels he finds someone that will fit with him nicely. Think of Dark Pit from Kid Icarus Uprising.
"Marcus can be seen as the sort of person who is truly calm despite the situation, no matter how bad things get. He is always the type to show his teammates that no matter who his opponent is "