Phasing Superhero

Currently I am working on how to explain a character that can "phase" through objects in a similar manner to Martian ManHunter. His abilities are negated by certain (rare) metals. His ability could be meta-human (like The Flash etc.), biological (ManHunter), or technology based.

What scientifically-plausible ability (not principle, though if you can show a principle and a way to manipulate it that's fine) would make the most sense for him to be able to doing this?

Superpower:

1. Must be able to pass through most materials at will.
2. Must have at least one material that cannot be phased through.
3. Must be able to phase himself and any object within two feet that has less mass than his body mass.

Edit:

4. Must become weightless or have a way to maintain current elevation so he doesn't go falling through the floor.

posted about 9 years ago

HadesHerald‭

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