Kakashi's "Son" (being re written)
Bingo book description: Ryuk also known as the tailed lighting flash, killed over 2000 rogue ninja and never lost a fight.
Weapons: twin katanas called storm braker, kunai, shuriken and lightning bow and arrow.
Overall: never engage in battle because if your ever lucky enough to see his face you will not live
Always wears a dark blue cloak.