Higure Tsukikage

Higure Tsukikage is the father of Shiro and Ryu and ex-husband of their mother, Kasumi.

Trivia

 * Higure alludes to ???
 * Higure (日暮れ) refers to the time after the sun has set, also called "dusk" or "twilight".
 * Tsukikage (月影) translates to "moonlight" or "moonbeams."