while i was away, i read a short but deliciously awesome manga about a guy named yuri who trains in a forest for 10 years. after this, he becomes buff. so buff in fact that he is immune to most, if not all magic of his world.
how does he fair as the new defense against the dark arts teacher at hogwarts?
some feats off the top of my head:
basic magic like fireballs and such bounces off his body.
he can "fly" by jumping up, then jumping again off the air.
he can attack from long range by, in his own words, "punch faster than light so that his punches catch on fire".
containment spells don't work on him as he just flexes his muscles and breaks them easily.
he is immune to poisons because he drips raw poison into his eyes so his eye muscles become stronger.
there are more but i'll get to them later.