Thirteen-year-old Mint Raburu was abandoned by her parents, whose constant busyness left them little time for her. Flashbacks of elegant childhood clothing hint at a potentially affluent background. This neglect fueled her early fixation on finding a boyfriend as a primary motivation.

Left entirely alone, she encountered Stick Bernard and Ray and joined their group. Stranded on an island, the team faced betrayal when a local town secretly handed Mars Base survivors to the Inbit forces. Houquet Emrose intervened to save Mint and the group from capture or harm.

Mint is spirited and precocious. Her youthful impulsiveness often irritates other characters. Despite this, she gradually integrates into the team, contributing meaningfully during missions and earning genuine affection. Her trademark is a distinctive E.T. cap, though the specific meaning of "E.T." remains undefined.

Her abandonment background shapes her initial quest for companionship, though this focus lessens as she becomes invested in the group's survival and goals. She develops strong bonds with the freedom fighters, relying particularly on Houquet for protection during critical moments like the island betrayal. While specific long-term development across all media isn't detailed, her role evolves from comic relief to a more integrated team member by the series' end. One episode centers on her, titled "Mint's Wedding March."

Her name appears misspelled as "Mint Rubble" or "Mint Labule" in some English-language releases, but "Mint Raburu" or "Mint Labule" are accurate renditions based on the original material.