Sumire

The water demon Sumire, the "Water Bottle", is a freak amongst Dead Apostles, living under water. She is the 21st of the Twenty Seven Dead Apostle Ancestors.

Traditionally, it is said that vampires cannot cross water streams, that rivers and oceans are an inviolable boundary. Sumire conquered those water streams, but as a downside, it became harder for her to act on the ground.

She is always getting drunk and thus considered to be lowly efficient, but she actually ranks high. She is the only one Dead Apostle who managed to use Marble Phantasm. The question is whether we could get a demonstration of power if she ever came out of water and sobered up.

She looks like a big sister who easily gets drunk, waiting in a castle. Rumors say she is on so good terms with Rita Rozay-en that they want to kill each other.

Source: Tsukihime Dokuhon PlusPeriod dictionary entry (p.181)