Even after an introduction, he is still those things. It just makes him one of those with a name and a reputation.

"Yeah yeah, you whine." he speaks to his Moogle before facing Vincent.

"Name's MarKus; Ace Mechanic and Blacksmith." He has fixed over a hundred robots. Gundanium is his body and Getter Rays are his blood... Unlimited Repair Works...

That's actually not a bad thing to put somewhere significant... maybe an epitaph?

"And yeah, sorry for just trying to go at your gun like that. I don't get to see a lot of modern tech shit around here."