Aoi Kunieda

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Kunieda differs from the other thugs at Ishiyama in that she has formal martial arts training from her grandfather, the master of the shingetsu style. She is also not a bully, and steers the leadership of the Red Tails towards preventing unnecessary fights in the school. This is what puts her first in collision course with Oga, as the latter is deemed by her to be responsible for most of recent violent events in the school.

They have two exchanges: in neither does Oga return her attacks, limiting himself to evade them, first to let baby Beel assess her strength and thus find out whether she is a potential replacement for him; later, because a failure in communication leads Oga to believe that Kunieda's condition to take Beel is that he should resist her charges. She is greatly impressed by Oga's speed and power, and misinterprets his advances on her as romantic interest. After he saves her from a plot by the MK5 she decides to leave the Red Tails and become a more disciplined person, and all the while her crush on Oga increases.

Later, she and the Red Tails intervene to stop the whole male student body of Ishiyama from attacking Oga, allowing him to proceed to a confrontation with Toujou unhindered.

At first she harbored some jealousy against Hilda, seeing her as a potential rival for Oga's affections. When she finally discovered the truth about Hilda and Baby Beel's true nature, their animosity disappears.

She is a skilled swordsman and martial artist, and possesses an immense amount of vitality and stamina, as well as impressive speed that is above Sakaki Mitsuteru's, who is known to be able to wield his sword at 250 km/h. She can use any weapon she chooses in battle, and has even been shown to fight with nothing more than a ruler. She is also very skilled at assessing opponent's strengths and weaknesses very quickly.