Akiha Tohno [Person's name]
One of the heroines in Tsukihime. Shiki's younger sister, and the Tohno family's heir. She has long black hair and a dignified posture, firm speech, and an unendearing personality. On top of that, her love of strict discipline can make her somewhat hard to get along with.
Perhaps it's because she doesn't think much of the way Shiki lived doing whatever he pleased for eight years, but she lashes out at him every chance she gets. Though she is basically straightforward and honest at her core, she is also unyielding and hates losing, so her true personality rarely gets a chance to shine.
She was one of the people involved in the accident eight years ago, after which her dormant Tohno blood was awakened. Though she would have been able to suppress it if she only had to worry about herself, she was carrying the burden of two people. As a result, she started being attacked by seizures nearly every night, and at Kohaku's suggestion began drinking blood to maintain her body. …Of course, it was all just a scheme to push Akiha closer to her Tohno nature. Probably, even Akiha herself was aware of it on some level. In one of the routes, she ended up inverting and demonstrating her power to its fullest extent. That dreadful form, with its fluttering vermilion hair, is probably capable of exceeding even a rampaging Arcueid.