Proxima Midnight

Proxima Midnight is an adoptive daughter of Thanos, the adoptive sister of Gamora, Nebula, Corvus Glaive, Cull Obsidian, and Ebony Maw, and a member of the Black Order.

History
Like all the children "adopted" by Thanos, Proxima was taken from her family and raised by Thanos to be a personal assassin of his. She joined the black Order. It is known for a fact that she did horrible things to her sister, Nebula. Only Gamora and Nebula were the siblings who made peace with each other rather than all her other siblings.

Family

 * Unnamed Biological Family
 * House of Thanos
 * Thanos - Adoptive Father
 * Black Order - Adoptive Siblings and Teammates
 * Corvus Glaive - Adoptive Brother
 * Cull Obsidian - Adoptive Brother
 * Ebony Maw - Adoptive Brother
 * Nebula - Adoptive Sister and Enemy
 * Gamora - Adoptive Sister and Enemy

Enemies

 * Guardians of the Galaxy
 * Peter Quill
 * Gamora
 * Rocket Raccoon
 * Groot
 * Drax the Destroyer
 * Mantis
 * Nebula
 * Avengers

Trivia

 * She is a member of the Black Order and like all members, has a surname associated with the color black (i. e. Midnight).
 * Interestingly, all daughters of Thanos have "A" at the end of their name (i. e. Gamora, Nebula, Proxima)