Kamen Rider Barbaric Demon

Kamen Rider Barbaric Demon is one of the many Oni Kamen Riders in the fanfictional series Kamen Rider: Echo Demon.

Banki
Banki is an Oni who was formerly apprenticed to Sabaki. Like most of the Oni Kamen Riders, it's unknown if Banki has a human form &/or a human name.

Demon Transformation Chord
A string brace-type transformation device.

Sound Attack Quake - Paradise
A guitar buckle.

Sound Attack Club
Two small guitar daggers.