Thanos

Personality
Thanos wished to spare other planets from the fate of his home world, Titan. However, he did it for drastic and evil desires, even killing those who stood in his way. Thanos still would keep his word, as he promised to help Ronan destroy Xandar in exchange for the power stone, promised Loki the Earth in exchange for the Tesseract. Though wishing to search for the Ininity Stones, he spent the next fifteen years finding a way to extract the stones from the teenagers. He also had caution in seeking the stones, especially learning that one of the stones were hosted by Elspeth, Gamora's daughter.

Despite his cruel nature, he loved his children unconditionally. He especially felt unconditional love towards Gamora, who was dubbed his favorite daughter and was ridden with guilt in having to kill her. However, he punished them harshly if they failed him. For example, Maw said there would be judgement if he failed Thanos in getting the Time Stone that Doctor Strange protected with his magic. Despite Maw failing, Thanos knew he was dead but knew that he at least tried. He later tore Nebula apart and had any part of her replaced to make her stronger every time she failed against Gamora; however, he did not realize that it just tore her apart, both physically and emotionally.

However, after Thanos saw his future self from 2018 viewing past Nebula's memories and his death, he realized that people would not be able to move on from the Decimation and remember life before it and decided to rip the universe atom by atom and recreate it in his own image. However, he accepted his defeat at the hands of Tony Stark.