She has longwhite hair, pale skin, and orangish-red eyes. She has what looks like half an abyssal ship destroyer on her head with glowing eyes worn like a hat. Underneath the teeth, she is wearing shreds of a black serafuku on top, and black boots and gloves. On her back is a hip-mounted abyssal variation of destroyer rigging, with two large black arms bearing twin-cannonturret.
She notably holds a blue tasuki, similar to the one Kaga wears.
She is likely an homage to the destroyers sunk in the Battle of Vella Gulf, where four IJN destroyers, Hagikaze, Arashi, Shigure, and Kawakaze, were completely surprised by an American force of six destroyers in the middle of the night due to Americans using radar on their destroyers, while the Japanese did not (this being one of the first times the Japanese used destroyers on their own without a cruiser leader). The battle was a disastrous rout for the Japanese, with the Americans destroying all but Shigure and never receiving any return fire, and afterwards, the Japanese gave up even trying to resupply their Solomon Island bases with destroyers, significantly hastening Japan's bloody retreat in the Solomon Island Campaign.
Destroyer Water Demon may be a corrupt reflection of the merger of the three sunken destroyers, like Light Cruiser Oni, or may simply be Hagikaze, alone, whose side ponytail is not easily distinguishable, considering the visible tie to Kaga.
