Ron is a serpent-like creature who serves as Black★Rock Shooter's companion in the manga series, Black★Rock Shooter: Innocent Soul. He is able to form various weapons in Rock's arsenal, such as a blade or Rock's infamous Rock Cannon. Ron acts like a "big brother figure" to Rock and deeply cares about her.
Ron comes in the form of a snake-like creature with no discernible eyes. He has a long black body with a white stripe along either side and a prominent snout. He has a jagged ridge running along his back.
Ron is shown to be able to float and slither through the air, a little like a dragon. However, his most important ability is to transform into Rock's two weapons - a large cannon and a curved sword. He can transform at will or when Rock makes him.
He may be able to transform into other useful objects as well; he turned into a baseball bat in order for Rock to swat away one of Dead's skull minions. Other transformations he can undergo remain to be seen.
Ron also can become two guns at once. As allures of Rock will have increased power as a weapon.
Ron seems fond enough of his user, Rock. This is shown when he does not want to replace Rock with a new partner despite her instability. He can be quite a joker but he gets serious at the right time. He has a very intimate relationship with Rock. He appears to have a good battle sense and knows when to stand down or attack as the situation calls. He sometimes warns Rock of danger or imminent attacks which she cannot detect.
Ron is part of the Army of Black Shooters. He is one of a variety of "companion-weapons" to the Black Shooters that accompany them on operations and serve as their weapons.