Not too long ago I posted an article about how Zeus looks like the best choice on paper to be Star Lord's Father.
Here is a link to that article.
But he was originally intended to be part of a larger list of 5 people. One of those was pretty much disqualified from James Gunn's comments, and two others may have been as well, depending on how you read them. As such I decided to just go with Zeus. But the other three shouldn't just be ignored, so I wanted to include them in this list.
Adam Warlock has a variety of powers, one of which allows him to generate and manipulate cosmic energy. This could make it seem to Medrith that he was "an angel, composed out of pure light".
Also, we see his cocoon in Guardians of the Galaxy in the Collectors museum. This would explain why he wasn't able to track down Youndu and take back his son.
Star Hawk has an extremely long life span, and a large list of powers. Among them are creating constructs out of pure light, and channeling light energy through his body to make him tougher. These would definitely make him seem like an Angel, as well as make him "ancient" to the Nova Corps.
Originally he appeared in original Guardians of the Galaxy team, but so did Youndu, and that didn't stop him from becoming a space pirate in the first movie.
This one is probably the least likely of the group. Because the original Captain Marvel was a kree, there is no way the Nova Corp would not recognize kree DNA in Peter Quill. Despite this, he also seems like a good choice for a couple of reasons.
For starters, he opposed the Kree and Thanos on separate occasions to protect the Earth. And he is currently dead in the comics, although he left a legacy. From what we know of Guardians Volume 2, it will focus heavily on the idea of fathers. But that doesn't mean Peter has to meet his father.
This would work best if Peter learned who his father was, and his legacy is what the movie revolves around. If Mar-Vell died standing up to Thanos or some other tyrant, it would provide a villain for the new movie. It would also provide an emotional moment for Peter, learning his father was a hero.
So what do you think? Do any of these seem likely? Leave your opinion in the comments below!