Mizunokouji Asuka

Japanese name:	水乃小路 飛鳥
Nickname:	Tobimaro's sister

Tobimaro's sister. The very beautiful and petite girl was isolated, according to the Mizonokoji family's tradition, from any and all males from the day of her birth until the age of 16 (when an omiai will be held for her). Even her brother was unaware of her existence. Due to her daily training and the gene she inherited from her mother, she is insanely strong, once tearing a tank apart and fashioning it into a makeshift suit of armor with her bare hands. Nevertheless she is extremely timid and deathly afraid of males (as a result of her isolation), in part because the first one she ever met was Ataru Moroboshi. Now whenever she sees one, she pushes him away, screams "Eek! A maaan!" ("Aa~! Otokoo~!") (ああ～！おとこ～～！?), and runs, as she is unusually sporty for her age (being able to run 100 metres within 12 seconds even wearing her 200 kilogram suit of armour).

Asuka is very confused about gender roles and family ties. She feels inappropriate romantic urges toward her elder brother, Tobimaro, and sneaks into his bed at night to snuggle. In addition, she believes Shuutaro Mendou is also her “big brother” because she once overheard Ryoko Mendou refer to him that way. Asuka is engaged to Shuutaro in an Omiai, by arrangement of their parents, as a means of ending the age-old Mendou-Mizunokoji family rivalry. Unfortunately, as a simple hug from her causes multiple broken bones and internal injuries, it seems unlikely that this relationship will ever be consummated.

Wikipedia