Combination of the two words "oniwabanshu" (a type of ninja) and "bandana".
To spy on the Sailor Senshi
Oniwabandana is a ninja-themed Youma who is the final Youma created by Kunzite when he transformed tabloid photographer Nana Asahina into a Youma. She appeared in episode 43 where the Sailor Senshi fight each other to trick the Dark Kingdom.
Her main objective was to spy on the Sailor Senshi and gather more information.
Oniwabandana robbed OSA-P to lure the Sailor Senshi out. Sailor Moon and the rest of the Sailor Senshi arrived to stop her but ended up having an argument. While they were distracted, Oniwabandana reverted to her human form and snapped photos of them, attempting to question them. After suspecting that Nana (Oniwabandana) was indeed associated with the Dark Kingdom, Sailor Moon agreed to meet her and claimed to give her more information about leaving the Sailor Senshi.
Oniwabandana and Kunzite ended up attacking Sailor Moon during their confrontation and Oniwabandana choked Sailor Moon with her bandana. Sailor Mars burned away the bandana with her fire and then Sailor Jupiter and Sailor Venus combined their attacks to strike Kunzite. He protected himself in a force field and fled, leaving Oniwabandana to face the Sailor Senshi alone. To even the odds, Oniwabandana was able to create four clones of herself. Sailor Mercury used bubbles to confuse Oniwabandana and Sailor Mars used her fire to destroy the clones. Sailor Moon then used her Moon Healing Escalation to turn Oniwabandana back into a human.
- The name Oniwabandana is probably based on a combination of the two words "oniwabanshu" (a type of ninja) and "bandana".
Oniwabandana can multiply herself and attacks with traditional ninja weapons, such as shurikens and a katana blade. She can also extend her bandana into a strangulation device.
- Oniwabandana appears in Sailor Moon S: Quiz Taiketsu! Sailor Power Ketsushuu. She is among the monsters revived by Quiz.