Hey look my Aachi & Ssipak OC...because...I have no sense of self restraint

Doctor Strange created Mi-Ja for the sole purpose of patching up and caring for wounded mutants on the battlefield, since he couldn't be everywhere at once to do it himself, Mi-Ja shares the super speed and agility that the swordsmen mutants have (he has to to be able to aid so many people efficiently).

His main arms are grafted into surgical gloves and his secondary arms are fully prehensile, Mi-Ja can control their movements with no problem

The only reason he's a "medic" is because of his personality prior to modification: Mi-Ja is a doting, motherly mutant that sees all mutants as children and sees the other modified mutants as parents just like himself. If he finds a wounded mutant, he will dote on them, coddle them, and fix them up. His menacing appearance belies his motherly nature

An odd thing about him is that he's constantly crying, tears always stream down his face no matter what emotion he's feeling. Its said that Doctor Strange did this to make him look like a "true bleeding heart", someone who cares way too much about the well being of his own race