|Whatever life holds in store for me, I will never forget these words: "With great power comes great responsibility."
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Jun Yabuki (矢吹 ジュン) became the second Yellow4 of the Biomen. She is an Olympic archer, who after watching the Bioman in action, tries to join them but is initially refused, even though Mika Koizumi had just died.
Jun is an Olympic archer. Sometimes dressing up in a hybrid American Indian cowgirl/feudal Japan outfit. The last two letters in her surname "ki" form the kanji for her color. After watching Bioman in action, she tries to join them, but is initially refused due to her lack of understanding how serious the fight is. However, her fearlessness enabled the Bioman to learn that she is also a descendant of the original Bioman. When she accidentally injures Shirō during the Samecanth incident, Jun is confronted by her old squad captain who learns of her reasons for leaving the Olympic archery team and allows her to remain with the Bioman. Having the same abilities and arsenal as her predecessor, the new Yellow Four also uses the Bio Arrow (バイオアロー Baio Arō) as her weapon.
- Biojet 2 (shared with Green and Blue)
- Techno Brace
- Bio Sword
- Thunder Sword
- Bio Arrow
- Bio Machine 2
- Super Electronic Holography