Source: comicvine.gamespot.com

8. Stealth Armor

This one's a little more vague because there are a bunch of stealth armors!

My faves are the original blue boy, the super sleek Marvel Now stealth suit, and the skull and crossbones dead man Stealth Suit. The blue one (which I think is supposed to be black but coloring of the time rendered it as blue so that's how it's usually depicted) would be a fun way to do some callback stuff. We haven't had a monochrome Iron Man armor since the original movie and it could be cool to see.

But if they wanted to do a more lightweight stealth focused, non-weaponized suit, that would also be interesting. Having to balance power levels devoted to stealth with limited combat is a fun story challenge. Also Tony having to scrap together a bare bones armor that can get around Thanos's cosmically aware senses would be super cool.

The stealth armor is always most fun in the few scenes where Iron Man has to fight in it, as it drastically limits the powers we're used to seeing him display.