Source: notey.com

3. Nova

We have already had it rumored that a Nova is planned for the Marvel cosmic side of the MCU. But once that spacefaring sentinel makes his way home, we need to get him an Avengers membership card.

However, we still don't know which Nova will be the MCU's chosen one. Richard Rider and Sam Alexander both have their pros and cons, but either one would work excellently. Richard would work if they want a slightly older, more experienced Nova, while Sam would fill the teen hero role currently being filled by Spider-Man.

With Nova, the Avengers would have a more cosmic team member without having to strip the Guardians of one of their crew. I'd personally love to see the Human Rocket blasting off alongside Iron Man or having an enraged Hulk punch his helmet off.

If I had a preference, I'd say to go with Rider for now, with the chance to add Alexander farther down the road if they want. But either one would be a good choice.