I think it's possible to believe that Odin of Asgard could be peter quills father. Since James Gunn isn't going with j'son of spartex. as I read in other articles. He seemed "angelic " and near the end of Gaurdians of the galaxy , Yondu calls that guy a jackass. We've all see plenty of instances where Odin was being a jackass,but we all know he's not 100% dick. I believe it could be odin because he is one of the few ancient beings in the MCU. So its very plausible. If not Odin then maybe even an evil being ? Someone we have seen but not really seen in any marvel movie.