Peter Quill

One more: Ego, a Celestial who took the form of a living planet, seeded thousands of worlds with his own biological matter, and fathered children across the galaxy hoping one would inherit his power. One of them is Peter Quill.

1988 — Missouri. Eight-year-old Peter Quill watches his mother die of cancer, runs from the hospital, and is abducted from the parking lot by a spacecraft. He is raised by Yondu Udonta, a Ravager, who had been contracted to deliver him to his father, Ego — and who quietly refused, having learned what happened to Ego's other children.

Peter Quill steals an Orb containing the Power Stone. Pursued for it, he ends up in a prison with Gamora (Thanos's adopted daughter, defecting), Drax (whose family Thanos's forces killed), Rocket (a genetically and cybernetically tortured raccoon), and Groot (a tree). They escape, sell out, un-sell out, and stop the Kree fanatic Ronan the Accuser from using the Stone to destroy Xandar. Groot dies saving them and regrows from a cutting as Baby Groot. The Stone is left with the Nova Corps.