Gamora

Gamora was a little girl when Thanos and his army invaded her home world, wiping out half the population. Gamora was separated from her mother in the attack, but Thanos himself took a liking to the young girl, giving her a blade as a present and shielding her from seeing the massacre of her people. Taking her in as his adoptive daughter, Thanos would go on to turn her into a living weapon with cybernetic enhancements. As she grew up, Thanos would force Gamora and her adoptive sister Nebula to fight one another.

Gamora alternate self used to fights alongside her fellow outlaws turned Guardians of the Galaxy, Peter Quill AKA Star-Lord, Drax the Destroyer, Rocket, Groot, and later, Mantis, developing true friendships with her teammates over time.

One of her old most important relationships is her bond with Peter Quill, who is romantically interested in her. Initially resistant to Quill’s flirtations, Gamora begins to return his feelings over time, eventually telling Quill that she loves him more than anything. They also used to tend to act as surrogate parents to the young Groot.

Four years later, Gamora alternate self and the Guardians intercepted a distress call sent by Asgardians; Thor warned them that Thanos had begun searching for the Infinity Stones himself. Realizing what Thanos intended to do with them, Gamora led her friends to Knowhere to procure the Aether, only for both it and Gamora to be captured by Thanos himself. Thanos took Gamora alternate self to Vormir, where he sacrificed her against her will in order to obtain the Soul Stone, a process that trapped Gamora's soul inside the Soulworld.

In her timeline, the Time Heist orchestrated by the Avengers who had come from a different reality inadvertently enabled Gamora and Thanos to learn how the future could unfold. Acting upon the obtained intelligence, Thanos brought his armies through the Multiverse from his reality to the Avengers' prime timeline. Gamora then turned against him, helping the Avengers and their allies to defeat him. After watching Thanos and his army turn to dust, Gamora, now stranded in a different universe than her own, left Earth and joined the United Ravagers.

Gamora, throughout most of her life, has been molded into a living weapon, and the only family that she knew and raised her are the people she considered enemies. Because of her assassin background, Gamora can be stoic, distant, and merciless to her foes or targets.

During combat, she can be aggressive and ruthless due to her tendency for war cries and her willingness to kill without restraint. However, she will often use strategy to avoid murder when possible such as talking kindly to Nebula and convincing her to listen to her alternate version and switch sides, and even though they didn't get along, she still loved her as a sister to some extent, refusing to kill her, even when she threatened to shoot her.

While initially spending time with the Guardians, she is aggressive, ruthless, hot headed, and even growing frustrated with their actions. She particularly grows frustrated with Quill, who repeatedly attempts to convince her that she is like the same Gamora he fell in love with and dated, despite she her self acknowledging that she is not that Gamora. However, the longer she spends time with the Guardians, Gamora begins to realize how much her alternate variant meant to Peter Quill and the rest of the Guardians despite her rocky start with all of them. After seeing how far the Guardians were willing to go to save Rocket, she decided to help them protect him and stopped Adam Warlock from taking him. She aided Quill and Groot in applying the pass key to bypass the kill switch. As Rocket's heart stopped, Gamora struggled to keep her composure and nearly started to sob. Then, once Rocket's condition became stable, she smiled with tears flowing down her eyes as she saw Quill and Groot hug Rocket in relief. This shows how she had begun to grow attached to the Guardians and how she could still be moved by extreme acts of love and devotion. Before leaving, Gamora tells Quill that even though she was not the same version he had, she admits that they could have been a fun pair under different circumstances.