Demon Seed Arc
- Kuan (クァン)
- A wild boy Chōjin that befriends Mantarō after a devastating loss.
- The Constellation (ザ・コンステレーション)
- An Icelandic constellation chojin. Choujin Power: 8,200,000. He had similar 4D powers to Pentagon and Black Hole. He defeated Buffaloman and then defeated Mantarou's Muscle Millennium technique. Mantarou eventually defeated him with an incomplete Muscle G.
- Gepparland (ゲッパーランド)
- A fish-faced chojin from Marseille, France. Choujin Power: 8,450,000. He fought and lost to Hanzou.
- Meltdown (メルトダウン)
- A motorcycle chojin from Chicago, Illinois. Choujin Power: 9,540,000. He fought and lost to Ilioukhine.
- The Tattooman (ザ・タトゥーマン)
- Chojin from Hokkaidō. Choujin Power: 8,600,000. He fought Barrierfreeman to a draw.
- Voltman (ボルトマン)
- A high-voltage Jamaican Chojin with a microwave oven in his chest. Choujin Power: 12,000,000. He and Ashuraman formed the tag team The Demolitions. They fought and defeated Kevin Mask and Scarface and then faced Mantarou and Kevin. Voltman was defeated by Mantarou and Kevin's Niku→Lap technique.
- Reborn Ashuraman (再生（リボーン）アシュラマン) / Shivano
- An Asura chojin from the previous series. Choujin Power: 10,000,000. A family tragedy turned him back to the side of evil. While fighting Scarface he developed the Ultimate Ashura Buster, combining the Ashura Buster and the Ultimate Scar Buster. He was defeated by Mantarou's new finishing move, the Muscle G.
- Shiva (しは)
- Ashuraman's son. He was training to be a Seigi Chōjin like his father, but when he discovered Ashuraman's evil past his demon blood takes hold of him. He later kills his mother causing Ashuraman to kill him and, as a result, return to his demon ways and team up with General Terror.
Read more about this topic: List Of Ultimate Muscle Characters
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