- Name: Omegaman Dexiá (オメガマン・ディクシア)
- AKA: The Omegaman (ジ・オメガマン)
- Classification: Perfect Chojin
- Homeland: Omega Centauri
- Age: Unknown
- Height: 231 cm
- Weight: 208 kg
- Chojin Kyodo: 86,000,000 Power
- Favorite Techniques: Omega Metamorphosis, Omega Catastrophe Drop
- Family: Omegaman Aristera (brother)
- First Appearance: Survivor Match for the Kinniku Throne Arc
- Seiyu: Ken Yamaguchi
- Giant Hand (巨大な手, Kyodai na Te)
- Omega Metamorphisis (Ω変身 Omega Metamorufōze)
Omegaman transforms himself into a dead chōjin and uses their moves.
- Omega Catastrophe Drop (Ωカタストロフドロップ)
Omegaman transforms into his giant hand form. He then grabs his opponent, he puts their arms behind their back, grabs their legs and put his feet on their shoulder blades. Then he drives them into the canvas headfirst. It is a highly feared and deadly technique.
- Omega Bloodspray Fang (Ω血煙り牙 Omega Chikemuri Kiba)
A Perfect Chojin bounty hunter for Chojin Enma who retrieved chojin who escaped from the Chojin Hakaba, including Screw Kid, Junkman, Atlantis, Sunshine and Sneagator. During the Survivor Match for the Kinniku Throne, he was involved in another such mission to retrieve Neptuneman. While on Earth, he joined Kinnikuman Super Phoenix's team. Omegaman defeated Geronimo with the Omega Catastrophe Drop which resulted in a tag match, Neptuneman and Kinnikuman vs. Omegaman and Super Phoenix.
The match was for each person's page in the Muscle Prophecy book. The pages were tied to a string which hung over a torch. Neptuneman ended up losing his page and dying. This pitted Kinnikuman and Omegaman against each other. Omegaman used his Omega Metamorphosis technique which turned him into Prince Kamehame. Through the course of the match, Kamehame's spirit took over and he finished teaching Kinnikuman the Kamehame 100 Special Techniques. With those techniques at hand, Kinnikuman turned Omegaman back into himself and defeated him with the Muscle Spark. Omegaman's prophecy page was then burned, and he faded from existence.
It was revealed in the True Devil Chojin arc that his complete name is Omegaman Dexia by his older brother Omegaman Aristera.
- Laugh: Fo~fofo!! (フォーフォフォ)
- Submitted by Jun Watanabe (渡辺純) of Hiroshima and Etsuo Ugomori (鵜篭悦夫) of Ehime.
- Chojin Hunter
- Team Super Phoenix: Center Guard (Finals)
- Win/Loss Record
- O Geronimo (Omega Catastrophe Drop)
- O Neptuneman (Omega Catastrophe Drop)
- X Kinnikuman (Muscle Spark)
He was likely named after the movie The Omega Man.