Source: pinterest.com

5. Symbiote Armor

I mean, it's out of left field for sure but anything's possible.

In the comics, this armor came about in the aftermath of the Axis crossover. Tony Stark had his brain re-aligned from good to evil and made an armor using symbiote tech so it could liquify and reshape as needed. He was also very evil and flaunted it non-stop.

But when he went good again he shed the symbiote armor for something a little more like the suit he sported in Infinity War. And this is about on par.

Infinity War already gave us a shapeshifting armor that could refit its needs and uses as Tony saw fit but that one wasn't as liquid as this would be. Plus it gives us some fun story ideas. Maybe Tony gets the symbiote from some off-world market and builds it into his suit. Maybe he doesn't know it's alive and just stores it after the adventure is over. Maybe a young protégé like Peter Parker starts messing around with Stark's old toys and maybe we have an MCU Venom on our hands all of a sudden. Probably not, but a guy can dream.