Mirian Solar

Mirian Solar (ミリア星人ソーラ) (39): Long ago, her family was slaughtered by Zone soldiers, though Billion saved her life, gaining her undying loyalty as a result. Eventually, she arrives on Earth, saving Billion from the Fivemen. Billion took advantage of Solar's love for him, by sending her after the Fivemen, with Five Yellow wanting to settle the score. Using one of two special transforming pills, Solar transforms into a monstrous version of herself, called Dark Solar. Though powerful, Solar could not maintain the form as she painfully regressed. Though she failed, Billion gave Solar a day with him as promised. Once the time ended, Solar consumed the last pill to become a monster again and resumed her hunt for the Fivemen, who tried to open her eyes to Billion's deception. During the fight, Billion accidentally wounded Solar, eventually revealing that he was responsible for her family's murder. Enraged, Solar attempted to kill Billion, but could not due to her feelings for him and allowed Billion to fatally wound her, regressing to human form. Solar died with the Fivemen surrounding her.