10 Outrageous Guardians Of The Galaxy Vol. 2 Theories
3. Peter Quill's Dad Will Be The Villain
J'Son of Spartax is the father of Star-Lord in the comics, but according to Gunn that will not be the case in the movies. However, that doesn't completely rule out the character from appearing entirely. One interesting theory suggests that instead of being dad to Quill, he could be his latest foe instead.
In the comics he's the leader of the Spartoi Empire, who would be suitable villains for the sequel, with J'Son as the major opposition. They have a great mastery of weapons, and live for an extremely long time compared to humans, so could well prove to be a difficult enemy, while the inclusion of Quill's father from the comics in a different role could serve as a major (if not quite Mandarin level) curveball.