nanaya shiki
Tohno Shiki's dark persona (sort of) turned distinct character thanks to the Melty Blood games, mostly distinguished from Tohno Shiki by the look in his eyes and the amount of smugness. Usually tagged as both characters unless there is good evidence to the contrary--for instance, White Len only hangs around Nanaya, and Nanaya doesn't wear glasses.
This was Toono Shiki's original name before he took Tohno Shiki (2)'s place.