Relationships focusing on Mantis.
Ego is Mantis' former master.
He found her in the Larvae estate on her home world and kept her as his own. However, she later misinterpreted this to being his pet by Drax. She notably helped him sleep at night, but Mantis knew that behind Ego's true colors is a man who has killed his own family. Mantis grew terrified of her master, but still remained in his services because she had no where else to go.
Mantis formed a friendly bond with Drax after meeting him on Berhert. However, Drax was scared of her at first, as he thought her attempts to smile at him were disturbing. The two bonded on Ego's planet.