Wakana Sakai lives with her father and her pet cat, Dora. Her mother passed away a few years ago. She is part of the "Choir and Sometimes Badminton Club".
Wakana is a young girl who has black hair that is usually tied up into a high ponytail. Her eyes are brown, and her skin is quite fair.
Wakana is a serious and down-to-earth person, always trying to be reasonable with everything. She sometimes can't say no to someone's pleading.
As she was a music student previously, her school uniform consists of a white blouse, blue ribbon, blue dress, navy socks with two white stripes and brown shoes.
Despite the fact that she is apparently very good at singing, she refuses to do so to the point of turning down Konatsu's earlier attempts to recruit her into Konatsu's new choir club.
When she was in her last year of middle school, she was too focused on her exams and tended to lash out her emotions to her mother. At that time, she didn't know that her mother was sick. She now lives with regret for being unable to say "I'm going", "sorry", and "thank you" to her mother. She asked her father "Why didn't mother told me about that she was sick?" After she heard her father explain why, Wakana ran to her room crying about the piano that she told her father to throw it out has her mother's handmade keychain that was made for her. Ever since, Wakana seems to have found her resolution, and finally joins the choir club. Wakana had also finished the song that her mother had started to remove her regret of turning down her request to write a song together. Mahiru and Sakai's song is entitled Radiant Melody. Wakana becomes the Pink WestStop Ranger as well.
- She loves cats and cakes.
- Though a serious person, Wakana was once called as an 'unexpected airhead' (dark horse tennen) by Konatsu due to her explanation about types of dogeza. (from BD vol 1 character commentary)
- Other notable characters Wakana's seiyū, Saori Hayami, had voiced include Erika Karisawa from Durarara!!, Tsubaki Kamigamo from Ouran Highschool Host Club and Rion Yamashiro from Chihayafuru 2.