Thanos

Thanos is the main antagonist of Once Upon a Marvel, until half-way through the story-arc, where Lady Death becomes the antagonist.

History
when Thanos kidnapped Lotus and her best friend, Lucy Mills,  he revealed to her about her maternal family and showed her a drawing of them, as well as their other family members. However, her grandfather, Yondu rescued her.

Enacting the dark curse, he takes Gamora's heart after being given this brief ability by the Wish Realm version of Zelena and her sister, Regina Mills.

Family

 * Alars (father)
 * Proxima Midnight (adoptive daughter)
 * Corvus Glaive (adoptive son)
 * Cull Obsidian (adoptive son)
 * Ebony Maw (adopted son)
 * Gamora Quill (adoptive daughter)
 * Peter Quill/Star-Lord (adoptive son-in-law)
 * Lotus Quill (adoptive granddaughter)
 * Nebula (daughter)
 * Daina (grandmother)
 * Kronos (grandfather)