The protagonist.. Karin is a "blood-producing" vampire (in Japanese, 増血鬼 ("zōketsuki") — literally "haematopoietic demon"); rather than needing to acquire blood from humans, her body produces too much blood instead (polycythemia).

Karin Maaka

The protagonist.. Karin is a "blood-producing" vampire (in Japanese, 増血鬼 ("zōketsuki") — literally "haematopoietic demon"); rather than needing to acquire blood from humans, her body produces too much blood instead (polycythemia).

All data from the awesome folks at Marvel.