Thanos

Thanos is the adoptive father of Nebula and Gamora, the adoptive grandfather of Nathan, Petra Quill, and Yondu Quill, and the adoptive father-in-law of Peter Quill. He is again after the Infinity Stones, putting the lives of Lola Lokisdottir, Princess Wanda, May "Mayday" Parker, Petra and Yondu Quill, and Thea Thorsdottir.