Akeginu was chosen to be one of ten ninja to represent the Iga Tsubagakure clan against the chosen ten of the rival Kouga Manjidani clan. The kanji forming her name translates to 'red silk' which matches her technique and her manner of dress.
As the bodyguard and confidant of Princess Oboro, Akeginu is more forgiving of Oboro's lack of ninja skills than the rest of their clan, caring for her almost as an older sister. Regardless, her first loyalty is to the whole of Iga. So when word of the Hattori truce's cancellation reaches her, Akeginu holds no reservations about deceiving Oboro while aiding her comrades in their attempt to assassinate the Kouga ten - including Oboro's lover Gennosuke. In light of her obligations, Akeginu does feel sympathy for Oboro's predicament and is the only member of the Iga ten besides Koshirou who doesn't ostracize Oboro after she makes the decision to seal her eyes. She even keeps safe from the other Iga the flute Gennosuke left in Tsubagakure so that Oboro would have a memento of her lover after the war ended.
A highly attractive woman, Akeginu (like Kagerou, her counterpart in the Kouga ten) is representative of the traditional concept of the Kunoichi in her ability to use her sex appeal against members of the opposite sex.
In battle, her technique grants her control over her blood; secreting it out of her pores and allowing her to squirt it into an opponent's face to distract them or create a fine mist to grant her the cover to move and attack in near complete stealth. Additionally, her technique can be used to "tag" any opponent who specializes in covert movement (as evidenced by her aide in Yakushiji Tenzen's fight with Kasumi Gyoubu). She's also in love with Tenzen's student Chikuma Koshirou, whom she had wished to marry in the future.