Red: Seems a bit too restrictive, and it doesn’t seem to be that fun in the long run. It’s not like anything you touch while invisible also turn invisible, it’s only your clothes. However if that were the case I’d give it more consideration, since the potential increases dramatically, but ultimately would probably still get a bit tired of it in the long run. I’m practically invisible anyway haha.
Blue: Wouldn’t be that effective when implemented into the (otherwise) real world. Without combining it with a power of near or absolute invincibility, or time manipulation, or super human reaction, there would be too much of a risk to die when using it.
Yellow: Seems extremely restrictive to be honest, it says “thoughts” for example. That would imply it would only be “fresh” things, i.e. not memories — unless the person actively thinks about something from the past. It’s basically just like hearing people’s inner dialogues, including any kind of mental imagery.
Green: Tempting, but feels like you’d risk dying or being captured while in the shapeshift form. When shapeshifting back you’re just inviting to be experimented on. Worst case scenario, you wouldn’t even be seen as a human, which opens up so many excuses to to further experiment on you. Sure you’d be able to escape by changing into some extremely powerful animal. Then what? Also, you’d need to study history extensively to actually unlock any possible potential when it comes to this power.
Orange: See Blue, and make it even worse. No thank you.
Purple: My second choice. Just like with Red it’s a bit restrictive when taking it as it is written, without any further detail. If objects, including living things, that you touch can phase through anything as well then yeah, it sounds pretty damn awesome. Still only my second choice.
Grey: This power right here, ladies and gentlemen, is what is called an “Omega” potential power. Omega is first and foremost a description of the actual power wielder, and secondly it would depend on that wielder if the power is great enough. All that aside, Grey — taken as it is written — is amazingly powerful. Restriction is thrown completely out the window here. There’s no mention about limitation on weight or size.
Pink: This falls behind Grey and Purple mainly because it’s restricted to non-lethal wounds.
The way they’re written, I would pick Grey in a heartbeat.
Feel free to chime in.