Oshino then renames her, giving her his own surname and the given name "Shinobu", which is written with the kanji for "heart" under the kanji for "blade".Throughout all of , she reveals that she was sulking.Suruga is cheerful, messy, very open about her numerous kinks, and loves to pick on Koyomi.While she used to be the ace of the Naoetsu basketball team, she is forced to quit because of the Rainy Devil in her arm.
Unlike the monkey's paw from the story, which grants the user's wish in a way the user would not want, the Rainy Devil grants the subconscious desires behind its user's wish. Suruga used the artifact twice in her past, but when she uses it for the third time, the paw grafts itself to her arm.
She is very beautiful, but also cold, spiteful, and wary.
This snappish temperament results from having encountered five con men who claimed they would cure her only to make off with her family's money, which eventually resulted in her parents divorcing.
She always does her best to help and support people who are in need, and ever since she reaches out to Koyomi during his vampire days, he sees her as his savior and treats her like some sort of saint or holy mother.
But Tsubasa's "goodness" comes from a lifetime of striving not to burden her legal guardians (neither of whom are her biological parents), and both her way of life and the way that the people around her put her on a pedestal causes her a great deal of stress.