Focuses on those featured in the anime, which was not intended to be an exact adaptation. As the anime changed some of the characters' names, they will be listed before the original (in the comics).
Main characters
An outlaw and the youngest wanted criminal in the western regions of Gearbolt, Philly in the anime is easily annoyed by his situation, but eventually likes the presence of S.A.M and Casey. He accompanies Samberry on her journey. Philly is also an immortal being, with all of his fatal injuries adding a number.
A young robot girl who is separated from her owner, Prince Toji. S.A.M. has an optimistic, yet naive outlook and enjoys befriending people. If one of her friends were to be in danger, she transforms into a Cannon Buster.
The young prince of Botica. Cautious, he was separated from his close friend, S.A.M. when his kingdom was under attack. He had to travel with Odin to Gara's Keep, much to his concern.
A very dark, mysterious man who is in search of the Last Heart which will unlock the secret of Gearbolt, and the power of Mora. After Botica was under attack, he took over the kingdom and killed King Bulgher.
An alcoholic rōnin who assists Samberry on her journey to find Prince Toji. He is the most level-headed of the group, but would laze around. In the anime, he was believed to be someone after Philly, but later became allies with him, S.A.M. and Casey for some time.
An abandoned assistant and junk mechanic, with an admiration for flying. Casey is optimistic and passionate, that she enjoys looking into whatever mechanism she can find.
A Botican soldier. He leads Kelby and the robot soldiers through their journey to Gara's Keep. The kingdom's situation has led him to feeling solemn, looking out for Botica's young prince.
- Philly the Kid (フィリー・ザ・キッド)
- Prince Kelby (ケルビー)/Prince Toji
- Casey Turnbuckle (ケイシー・ターンバックル)
Supporting characters
She suddenly encountered Kelby and Odin, seen as an attacker. She was spared and allied with the two of them afterwards, joining them on their way out of Botica.
A member of the Fraternity, she lacks arms and uses floating prosthetics. Dex is sly and sinister. She involves herself in hand-to-hand combat, with her prosthetic hands being able to have claws.
A robot in the Fraternity. She usually has a cold expression and would involve herself in hand-to-hand combat. She also pilots their airship.
A robot in the Fraternity. Her quirky look contrasts with her condescending energy. She had to fight against 9ine, until he found out she had beer on hand.
The ninja of the Fraternity. She is able to make clones of herself, but Odin was able to find her weak spot and punched the emblem on her headwear. She is the only member who does not speak.
The king of Botica. When Kelby wanted to see the city view, Bulgher worried about his son's whereabouts. He was then approached and held captive by Locke, when his kingdom was under attack.
A member of the Red Ronin, and a former comrade of 9ine's. It is inferred the two shared feelings towards each other, but their honor and duty keep them going as rōnin.
The assistant droid of 12welve, she quickly becomes friends with and dubbed "Victoria" by Casey in episode 21. She mainly accompanied 12welve, but stayed out of a fight between her and 9ine.
A very mysterious woman who sits in the shadows, she sent various bounty hunters to target Philly the Kid according to his past life experiences.
