Fanart of Kazuki. Source
A unisex Japanese name, more often used for girls
Kazuki is one of the two playable characters of Time Traveler. Kazuki is Mai's brother who died, he's got a small history which is also a bit about Mai.
Kazuki is slightly taller than Mai (the main playable character), even in her adulthood. He has short, messy and spiky black hair. He appears to be wearing a dark/black trench-coat and shoes of the same. There is also a hint of a blue top and a pair of black pants showing from underneath his coat.