Koharu, the Otaku motorbiker

Japanese, Average height, short black hair with blue streaks, with rather pretty like a doll face and she's very well endowed, apparently she has had multiple plastic surgeries both on her face and her breasts, specially the later which she proudly announces spending more than 1 million yen worth of boobs going from a modest B-cup to an impressive F-cup which she likes to bost off and smug about

She seems initially rather superficial taking an interest at another girl because she thinks she would look gorgeous smoking just like her, not knowing she was a minor, but after noting how uncommon she is, Koharu grew an interest in her despite the age gap, Koharu being in her twenties, finally she was really insisting on knowing said girl cup size since she looked bigger than her somehow being not only natural but younger than her so she's probably into boobs and impressed someone natural outsize her.

At the present day she works as a training tutor of Department of Motor Vehicles, specially training and accepting new licenses of Motorbikes although it's implied that she used to have a different life before how is she now, her tough aura, haircut and her quite large tattoo removed by laser on her back would imply that she was involved in a Yakuza like organization at some point of her life and she decided to quit for some reason, she became friend with a girl due the later being like her, where Koharu scape her previous life with plastic surgery and making a perfect like avatar for herself to departure from her previous life and be happy and comfortable with herself, seeing a bit of herself at her friend who just like her scaped her previous life and built a persona she's comfortable in her vtuber avatar

Seems to bit quite an Otaku, she is quite straightforward to show interest, she's used to guys drooling for her, which inflated her ego. Would ask someone out if interested enough although she'll remark she's not used to be the one asking for it since she's used to be the one being flirted, she seems to be into younger and younger looking either male or female

Likes to flaunt her 1 million yen worth implants she went from a B-cup to a F-cup after all quite a large jump, although even if initially superficial, Koharu has quite a lot of interest and a shady past life that she left behind after her multiple plastic surgeries which she's highly proud, she would probably still get more plastic surgeries

Cool, friendly, extrovert very open about her and her opinions, biker with a past she's scaping of, a bit superficial as her initial interest depends on her finding you interesting to begin with, very open and proud on the job done on her chest and her other surgeries, if interested in a girl she'll probably ask her cup size not that she mind sharing her size either, seems to be an Otaku of underground media like lesser known mechas, Mahou shoujos and visual novels