Fanart of Misotsuki. Source
Miso (みそ) = Miso soup + tsuki.
Misotsuki (味噌付き) is the protagonist of the legendary Miso Nikki (みそにっき).
Misotsuki has long brown hair tied in braids like Madotsuki. Her sprite and fanart of her shows her having red and brown eyes.
Misotsuki wears a reddish-purple shirt with a brown checkerboard pattern on the front. She also wears a purple skirt and reddish-purple shoes.
Not much is known about her personality because she is just a joke from a 2ch meme, but one thing for sure is that she loves Miso.
Very little is known about Misotsuki, as her game was taken off the internet for a few years. She is stuck in a Nexus-like area, with no explanation as to how she got there.