Arisa's Senpai has a unique look to her and has short black hair with a large mole just under her mouth. She stands to be about a six foot tall young woman. Being a "yankee" she dresses in a casual dress and a collard shirt most of the time. By her appearence in the manga she is about 17-19 years old.
Importance of the roll
In the manga Arisa's Senpai saves Arisa's life. Arisa was harrassed by her fellow gang members after she went "strait" and that is when Arisa's Senpai sprung into action. Knowing she could not defeat the gang by herself she rushed over to Kyoko Honda's house and alerted her of Arisa's danger. Once Kyoko saved Arisa's life Arisa's Senpai was never seen again.