Moxxie is Millie's husband and co-worker. They have a positive relationship and both adore each other. Moxxie even dedicates a song called "Oh Millie" to her, which can be seen at the end of the pilot.
Blitzo is Millie's boss. He is the founder and manager of Immediate Murder Professionals. Millie works as his bruiser alongside her husband, Moxxie, who is his weapons specialist. Millie seems to not mind Blitzo's invasive actions and appears to like her boss.
Loona and Millie don't seem to get along. As in the pilot, Millie can be seen flipping Loona off after Loona insults Moxxie.
Millie did not seem to mind being insulted by him but she drew the line when Eddie starts degrading Moxxie.