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Kagura Mikazuchi
Millianna thinks highly of Kagura because of her strength as she thinks of her powerful enough to beat Erza Scarlet, a close friend and an S-Class Mage of the Fairy Tail Guild. Kagura was also the reason that Millianna left Shô and Wally and joined Mermaid Heel as they share a hatred for Jellal Fernandes who enslaved Millianna and killed Simon and had also taken everything from Kagura. As fellow members of Team Mermaid Heel, Millianna happily cheers for Kagura when she takes part in a battle or event.

Erza Scarlet
When they were young, Erza and Millianna had developed a close relationship as both were slaves at the Tower of Heaven and members of a small group of children led by Jellal Fernandes. However, because of Jellal who was possessed by Ultear Milkovich, Erza was forced to leave Millianna and the others behind in fear that her possessed friend would kill the others. After eight years, the two were reunited when Millianna and the others attack Erza and her team during their stay at the Akane Resort. However, Millianna and the others were manipulated by Jellal into believing that Erza had abandoned them, prompting Millianna to willingly tie up Erza's friends and kidnap her in order to have her sacrificed to revive Zeref.

Following their escape from the tower and the revelation of Erza's innocence, Millianna apologizes to her, repairing their friendship and prompting Erza to invite Millianna, along with Shô and Wally, to join Fairy Tail. The three initially accepted the offer but later decided against it as they wanted to explore the world, having been trapped in the tower their whole lives. Erza willingly accepted their decision and arranges a Fairy Tail Farewell Ceremony for the three, complete with fireworks created by the other members of her team. Millianna is touched by the action and the two parties part, shedding tears of joy. After seven years, Erza and Millianna were reunited as members of two of the eight competing guilds in the Grand Magic Games. Millianna was planning on revealing herself after the competition but her longing for her lost friend made this difficult, prompting her to reveal herself after the second day and causing the two to have a tearful reunion.

Simon
Having been together since they were children, Simon was one of Millianna's closest friends. Millianna trusted Simon completely to the point that she was willing to help her opponents when Simon asked her to. Simon's death deeply affected Millianna as she still holds a grudge on the person responsible for his death even after seven years.

Wally Buchanan
Millianna and Wally have known each other since they were children as they were both enslaved in the Tower of Heaven and both were part of a small group of children lead by Jellal Fernandes. During their years together, the two developed a close relationship to the point that Wally knows about Millianna's interests. When they were assigned to kidnap Erza Scarlet with Shô and Simon, Wally, knowing about Millianna's love for cats, also picked up Happy as a present for her, an action that Millianna appreciated. After learning about Erza's innocence and escaping the tower, the two leave together with Shô in order to travel the world, having been trapped in the tower their whole lives. After some time, Millianna decided to join Mermaid Heel. Wally and Shô supported her decision and the three part ways with Wally and Shô keeping in touch with their long-time friend from time to time.