Ryoku is one of the most level headed people in his village appearing as calm and collected through most occurrences, except when it comes to his fear/hatred of the Star Clan. Ryōku is fearful of their power and their ways of battle, even losing self confidence in himself while comparing himself to Black☆Star.
Ryōku's appearance consists of a pewter colored bandana wrapped around his blackish hair, along with his outfit being a two tone blue shirt with green designs on it. He has bronze eyes. Ryōku wears dark blue shorts with his kimono top tied around his waist which his colored of a violet shade and having geta on his feet.
While under the Uncanny Sword's Soul Possession, his 's skin becomes pale and his hair lightens a shade. The markings of the Uncanny Sword appear on his face and his pupils become red as his sclera becomes a rust color.
Shadow Weapon Meister (暗器職人, Anki Shokunin): Although Ryoku once chose the Uncanny Sword as a weapon when given a choice by Masamune, it is unknown how much skill he truly possessed on his own as he was taken over promptly after.
Physical abilities: Ryoku possess some physical ability enough for him to be a suitable host for Masamune capable of fighting Black☆Star. How much of this skill applies to Ryoku himself, however, is unknown.
Sickle: His preferred weapon of choice is a simple sickle with a wooden handle and curved, clean blade.
- Partnered with Masamune
Main article: Masamune Nakatsukasa Uncanny Sword (妖刀, Yōtō): Ryoku once wielded the Uncanny Sword, granting him potentially power over shadows as well as a notable blade capable of cutting through at least Human flesh. However, while wielding the blade, he is possessed by Masamune Nakatsukasa via Soul Possession.
- Uncanny Sword Possession: While wielding the Uncanny Sword, Ryoku is possssed by the weapon trasnformer of the weapon form (Masamune) and as a result, his entire skill is derived from the aforementioned male.
- Puppet Shadow (傀儡影, Kugutsu Kage): Masamune controls the shadow of the person he has possessed for pincer attacks. The puppet can only say "shadow".
- Puppet Thrust (傀儡突き, Kugutsuzuki): By folding the Shadow Puppet around the blade, Masamune can increase the range of a lunge thrust.