Ruri's a hugely popular idol, and honestly, a lot of fans in the series are openly crushing on her—Shinra and Togusa among them, plus various members of the Awakusu-kai. Her appeal largely hinges on her delicate, almost ethereal look, which works perfectly for her image.
Before becoming an idol, she was a makeup artist. She actually did the vampire makeup work for Kasuka's first TV gig, which is kind of a fun detail about how she ended up in this world.
She collects figurines of monsters, beasts, and unusual human beings, and she's got pretty specific tastes overall. She loves cats and family, enjoys singing and monster movies, and has a thing for theatrical makeup. Summer sunlight and her own weaknesses get on her nerves. Diet-wise, she goes for liver sashimi and anything iron-rich—basically anything except garlic-laden food, which she can't stand.
Her favorite quote is "Solitude is a good place to visit, but a poor place to stay," attributed to Henry Wheeler Shaw. It probably tells you something about how she views her own life.
Content compiled by AnimeList.moe from publicly available sources.
Details
Birthday
Sept. 27th (Though on the faux wiki in Vol.4 it says she was born on Aug. 8th.)