Udagawa Ako is a third-year student in the middle school branch of Haneoka Girls' High School and is a member of Roselia. She admires Minato Yukina and her older sister Udagawa Tomoe, and is the best friend of Shirokane Rinko.
Ako is a short, petite girl with big, sharp crimson eyes. She has long light purple hair worn in curled pigtails with matching forelocks and straightened bangs. At times she has a fanged tooth.
Her casual attire borders on punk design with a cute flair.
Ako has chuunibyou tendencies, and has illusions of grandeur and magical powers. Rinko suspects this is the result from her playing online games frequently. She enjoys playing the role while keeping a realistic mentality. She is very cheery and noisy, and, despite only being two years younger than the other band members, is treated like the kid sister by the other characters due to her childlike appearance and personality.
Ako often wonders how she can be a "cooler" person, and sometimes feels inadequate compared to her other band mates, especially since Yukina and Sayo occasionally ignore her or scoff at her ideas at times.
A list of characters Ako interacts with in the game.
- Ako is a member of her school's dance club.
- Ako is both the shortest member of Roselia and shortest of all the 25 girls.
- Ako plays the dark summoner class in Neo Fantasy Online, the online game she plays with Rinko.
- Ako sings the beginning of verse 2 in BLACK SHOUT, and sings all the pre-chorus parts in Nesshoku Starmine.
- She cannot read sheet music properly.