triple ryuunen
The Triple Baka girls Akita Neru, Hatsune Miku, and Kasane Teto as high school students based on Channel's design (shown below).
Channel titled them とりぷる留年 (toripuru ryuunen, "triple class-repeaters").
Channel reused this design for Neru in the remake of Zako.
Examples
- Danbooru post #7920968
- Danbooru post #7989134: With Adachi Rei
- Danbooru post #8004183: Extended cast