I figure J'onn is a lot stronger than Piccolo, so I would give Piccolo the knowledge edge to start with.
So Piccolo knows the basic rundown of J'onn's abilities and his major weakness.
If J'onn can mind-read him in the middle of the fight then more power to him, but he won't start with any knowledge luxury.
Dunno.
He can use generic ki beams at least.
Piccolo has magic though, I'm sure he can conjure up some fire.
Re: Piccolo vs Martian Manhunter (stipulations)
Originally posted by CosmicCometvs.
Speed is equalized, so that there is no debate there.
Piccolo has basic knowledge of J'onn, but J'onn starts with no knowledge about Piccolo.
There's no debate. Anyone besides non delusional fanboys know Martian Manhunter is faster.
But under these stips J'onn stomps, obviously. Much too versital, and more than capable of defeating the entire JLA, Superman included.
Characters in DBZ utilize combat speed vastly more often and thus have a lot more feats with it. The characters who have it in comics do not use 1/10th as often. J'onn especially has so many powers that yeah he pretty much have a small handful of usable speed feats. I personally do not view Martians as having quite as high end super speed as some other characters have.
So he would get blitzed by Piccolo if speed was on, but if not then he just gets his mind shut down. Yep some might mention Piccolo creating fire, but they start half a mile apart and J'onn has ways of avoiding a physical attack while Piccolo is kind of screwed when it comes to dodging a psionic attack that has no real projectile to get out of the way of.