- Classification: Goku'aku Choujin
- Homeland: Unknown
- Age: 35
- Height: 200 cm
- Weight: 130 kg
- Choujin Kyoudo: 15,000,000 Power
- Trademark Techniques: 96 Killer Techniques, Dirty Giant Swing, Dirty Devil Soccer
- First Appearance: Anime Episode 125
Dirty Baron (ダーティーバロン) is the Goku'aku Choujin Leader. He drinks Buffaloman's blood in order to become his brother. Because the volcano underneath the ring where first fought Kinnikuman erupts, the match ends in a draw. During the rematch, he counters Kinnikuman's 48 Killer Techniques with his own 96 Killer Techniques and gains the advantage. In addition to Kinnikuman's, he also has variations of the other Seigi CHoujins techniques. The match and story arc conclude when the power of the Sword of Justice is suddenly awakened and blows him away (it is believed that this quick ending was devised due to the series' cancelation).
Like other Goku'aku Choujin, he can change his appearance to fool people. He disguised himself as Kinnikuman in order to fool Princess Lilly into showing him her treasures. For a while, the disguise worked and he made a convincing Kinnikuman. The first time he let the disguise slip when he refused a giant Gyudon in favour of a steak, when the real Suguru would never refuse a Gyudon. His identity was discovered when he lost in a game show-style challenge, after the real Kinnikuman answered a question correctly. The results were neck and neck, Suguru broke the tie and the Goku'aku Choujin were forced to show themselves.
- Seiyū
- Daisuke Gōri
- Win/Loss Record (Anime Only)
- Δ Kinnikuman (Interrupted by volcanic eruption)
- Δ Kinnikuman (Interrupted by Buffaloman)
- X Kinnikuman (Sword of Justice)