Phirasaurus Human

Phirasaurus Human appeared in 1971 TV series called Kamen Rider. Phirasaurus (ピラザウルス Pirazaurusu) (a.k.a. Phirasaurus Human (人間ピラザウルス Ningen Pirazaurusu)) – A piranha-dinosaur monster.

The first Phirasaurus had the human guise of a bus driver, and after using his death gas ability to kill the people in a bus it was discovered his poison was so potent it killed him as well. Phirasaurus was a project from Shocker commander Maya (マヤMaya), and she quickly looked for a stronger person to be altered.

The second Phirasaurus was pro-wrestler Noboru Kusaka (草鹿昇 Kusaka Noboru). He was captured, brainwashed and had his body altered, becoming the perfect Phirasaurus. The new Phirasaurus was able to match and defeat Kamen Rider #2 with his Ultra Kick. Brainwashed, Kusaka returned to the wrestling world as Satan Mask, and attacked his own brother when he tried to speak with him. He eventually faced Rider #2 in a wrestling ring. During the battle, he accidentally killed his commander Maya with his poisonous gas. In the end of episode 17, Kamen Rider #2 and Phirasaurus exchanged a Rider Kick and an Ultra Punch. Afterwards, both fell on the ring and Kusaka returned to human form, recovering his memories.

Powers and Abilities
The Phirasaurus Human's main ability, engineered from the original Phirasaurus, was releasing a poisonous breath. Appearing as a powerful mist, the Phirasaurus' poison was said to be able to kill a dinosaur in seconds. During its test run, the poison of the Phirasaurus Human was able to kill a bus full of humans, however, the poison was so potent it resulted in the Phirasaurus Human dying immediately after, thus a stronger human was needed to be modified. The second Phirasaurus, Noboru Kusaka, had an unbelievably strong body, able to shrug off rounds of a cannon, and special techniques called Ultra Punch and Ultra Kick, similar to the Rider Punch and Rider Kick.