*Marin Kitagawa is the female protagonist in the Sono Bisque Doll wa Koi wo suru series.

Marin is a tall, young girl with long hair that has a gradient from blonde to soft pink. her forehead is covered by part of her bangs and reach down to her eyelashes. Two small locks of her hair extend down past her shoulders in her front. She has straight hair in the manga which eventually becomes curly. She has multiple silver/white ear piercings all over both of her ears.

For her school uniform, she wears a white button up sleeved shirt tied at the waist in the front. Her sleeves are often rolled up to her elbows. She wears a light blue school uniform skirt that reaches knee length and a dark grey tie, as well as accessories such as a choker and other jewelry. She wears black socks and brown shoes. She has long, sharp, sparkly pink painted nails.

Marin is extravagant, messy, and while quite mature, she's also clumsy. She is massive otaku and a passionate cosplayer. She is very kind, friendly, cheerful, open-minded and outgoing, is considerate of others, sometimes generous and is very helpful towards Wakana, wanting him to stand up for himself. She is bold and confident, but also a bit scatterbrained, being impractical and unskilled at handiwork. She's also not very good at cooking and can get emotional at times as well.

One outfit of hers is very simple, being a black tied bikini with yellow flowers patterned on the top. Her accessories, hair, and makeup is normal. She doesn’t have socks or shoes but her toenails are painted pink. She did however wear a blue and yellow flannel shirt as well as jeans on top of the outfit before undressing.

Another outfit consists of a simple, low-cut, black dress. The dress crops to below her hips, and the sleeves of the dress are shoulder-less and flare out at her forearms, covering her hands. She wears a fake black fabric button-up collar on her neck as a choker. Her hair and makeup is normal, and she has short black socks with gray and black shoes.

Notably Marin has no real sense of shame, or at least with someone she trust like Gojo; though she does seem to enjoy messing with him about it. This included wearing a swimsuit to make it less awkward for Gojo taking her measurements, and even taking him with to a lingerie store for garters needed for her cosplay costume; the latter case, she even jokingly offered to model lingerie as a reward/thank you for him. At one point she is in just her night gown when Gojo visits, only noticing later that she wasn't wearing a bra; though she passes it off as unimportant, as it was only the shirt collar level of exposure.

At school, he meets Marin described as a dazzle girl of lots some allies... Alone with her leader.

Her mother unfortunately died when she was very young, leaving her under the care of her father. Although he loves her, Marin's father is often called to work abroad, leaving her to live alone on most days, usually visiting Gojou's house and indulging the food.

Prior to the start of the series, Marin secured a part-time job as an amateur model.

At the end of the series 7 years later, her and Gojo are married.*