One of the many Japanese guitarists I don’t know, but has a cool custom guitar made by ESP™ is Sakito.
NECK: Maple / Ebony, 24Frets
SCALE: 25 1/2″
NECK P.U: Seymour Duncan SSL-1
BRIDGE P.U: Seymour Duncan TB-4
BRIDGE: Original Floyd Rose
CONTROL: 1Volume , PU Select Switch , Coil Split Switch
More info can be found at http://www.espguitars.co.jp/gallery/sakito/index.html