Vance Astro needs to be in Guardians of the Galaxy 2, and I am going to tell you why. If you don't know who Vance Astro is, don't worry, you are far from alone. I have spent a lot of time reading comics. I also read Wizard religiously, so I was familiar with characters from books I had never read. But when Marvel announced the Guardians of the Galaxy movie, I had never heard of them. So I went out and found a bunch of comics. Right away I noticed that there two different versions. There were older comics with one team that took place in the future, and newer ones with a completely different team that took place in the current Marvel universe. Vance Astro was part of that original team, though he did show up in the pages of the new team's book.
Vance was an astronaut who was put in stasis and sent to a world a thousand years away. He would be awakened periodically for a year at a time to do maintenance or perform a course correction. His body was enclosed in a protective metal sheathing to protect it from the ravages of time. While in stasis his mind continued to work, causing him to develop psionic powers. After a thousand years Vance arrived at the planet that was his destination, only to find a thriving civilization of Earth colonists waiting for him. In the centuries that his trip took, man had discovered the secret of faster than light travel and had beaten him to the planet by several hundred years. He also found that he could not remove the protective metal covering from his body or he would die instantly.
In the original Guardians of the Galaxy book the eponymous team is a group of freedom fighters against the invading Badoon. Astro joins the team, which also included a very spiritual, noble savage archetype named Yondu, who you will notice was portrayed very differently in the movie.
In the comics, Vance goes on a quest to recover Captain America's shield, which he then wields in tribute to his childhood hero. Lacking Cap's skills, he uses his psionic powers to make the shield return to him after he has thrown it. He is later able to shed the metal suit, and takes up a (very 80's) costume that is very much based on Captain America's.
In the present day Guardians book, they find Vance encased in ice on an asteroid. He has somehow been sent back in time. He is still encased in the suit, and has Cap's shield. He joins the team and helps them in their fight against Magus, an evil incarnation of the hero Adam Warlock, who was an easter egg in the Guardians movie.
Having explained all that, here is why I think Astro would be a great addition to the second Guardians movie. First, his back story has a great tragic-comic element that fits perfectly with the tone of Guardians. Think about it, he volunteered to spend a thousand years by himself on a ship to be the first man to visit an alien planet, only to arrive and find a crowd of people waiting to greet him.
Second, imagine the scene where he is discovered. A body frozen in ice, then they see the shield. What a great call back to the first Captain America movie. Plus, Vance carrying the future version of the shield would give the Guardians a needed link to the rest of the MCU. He would also be a touchstone for Quill to Earth, as they would have grown up around the same time.
Finally, he could be used to move the story forward. Coming from the future, he would have seen the results of what Thanos is preparing. He could warn the Guardians that Thanos is creating the Infinity Gauntlet. He could be the catalyst for the inevitable Guardians/Avengers crossover which we all assume will take place in Infinity War.
I see a lot of potential in the character, and think he would be a great addition to the Guardians. Just one thing, if you do use him, please drop the Major Victory moniker. I can deal with talking raccoons and anthropomorphic trees, but that name is just too corny.