Iron Man has fought against characters that can phase and has enhanced his armor accordingly. It's been demonstrated that when a character attempting to phase, comes in contact with the armor, they will are shunted back and receive intense feedback and pain.
Iron Man has also had telepathic protection built into his armor since the 90s that protects him from telepathic manipulation while he's inside the armor. Multi-spectrum scanners, such as infrared used to detect Invisible Woman, will pick up invisible characters.
With both characters being literal "swiss army" knives by having such a variety of powers, and Iron Man having defenses against most of Martian Manhunter's attacks. It's going to come down to brute strength and speed. Manhunter has the strength to knock Iron Man around really hard. While Extremis Iron Man is no slouch when it comes to strength, Extremis Iron Man real strength lies in speed, and superhuman split second reaction time that give villains/heroes a very hard time. And the final factor comes down to where they are fighting and circumstances of the fight. I'll hold off on my decision until that's clarified.
Originally posted by TheEvilHex
hows mm going to do ne thing if he stays phased.
Actually, he can. Fires his Martian Vision. Use his telepathy. Render himself both invisible and intangible. Make multiple clones of himself.
Or just his supersonic superspeed while both invisible and intangible to rip Tony's still beating heart out.