One possibility is Thanos. He might see Star Lord as a threat or as someone who can lead him to more Infinity Stones. Another could be Ronan the Accuser. He may want revenge on Star Lord for past defeats and abduct him to make an example.
Definitely not. Star Lord has his own specific storyline and power set in the comics that don't classify him as a Celestial. His adventures and role in the comic universe are separate from the Celestial beings.
Yes, Star-Lord is funny in the comics. His personality and the way he interacts with other characters often result in hilarious moments. His humor helps lighten the mood in otherwise intense situations.
In certain comic runs, Star-Lord's bisexuality is explored. This adds depth to his character and shows a more diverse representation in the comic world.
Star-Lord isn't classified as a celestial. His background and abilities are distinct from those of celestials. He has his own unique story and powerset within the comic universe.
In certain comic runs, Star-Lord's character was indeed shown to have bisexual tendencies. This was a way to add more depth and diversity to his character.