Kinnikuman Kaijū
The Kaijū Extermination chapters of Kinnikuman featured several monsters that destroyed portions of Japan or attempted to capture the main characters.
- Kinkotsuman
- Iwao (イワオ?) (Rocky Slabb in the English dub of Nisei) is a rock Kaijū who first appears at an amusement park and is subsequently defeated by Kinnikuman. He returns when Kinnikuman is being interviewed by Natsuko and plans to beat him up in front of her and ruin his image. His first attempt is interrupted by Kappatron so he tries to take Natsuko hostage, but he is still easily defeated by Kinnikuman. He then takes on the role of Kinkotsuman's sidekick and helps him with all of his attempts to destroy Kinnikuman. They seemingly turn good after the Choujin Olympics, but return as villains during the American Tag Tournament. In the anime, the two of them eventually join up with Detective Gobugari and act as Kinnikuman's main cheering squad. In Ultimate Muscle, he was renamed Rocky Slabb.
- Iwao is not that bright and frequently copies Kinkotsuman's laugh and speech pattern. For example, he frequently says dawasa (だわさ?) (which Kinkotsuman often ends his sentences with) as a single sentence, seemingly meaning "I agree". This annoys Kinkotsuman and often prompts him to bop Iwao on the head. Iwao also refers to Kinkotsuman as Sensei. He is voiced by: Masaharu Satou in Kinnikuman, and Yasuhiko Kawazu in Kinnikuman: Scramble for the Throne.
- Nachiguron (ナチグロン?) is a weak Kaijū that is afraid of humans. Kinnikuman is dispatched to fight him, but realizes Nachiguron is harmless and lets him go. Originally 60 m tall, he shrinks down to around 1 m and moves in with Kinnikuman and Meat. Meat initially objects to the idea, already having to take care of one big baby (Kinnikuman), but agrees if Nachiguron will take care of himself. He gives Nachiguron a special whistle to blow if he ever gets in trouble and sends him out to get the groceries. Nachiguron is then confronted by the Kaijuu Yakuza for siding with Kinnikuman. He almost blows the whistle, but instead decides to take care of himself. He shows up again from time to time cheering on Kinnikuman or serving as referee, but is not seen again after the Choujin Olympics. In the anime however, he first appears during the Choujin Olympics as Zangyaku-seijin's cowardly minion, but eventually sides with Kinnikuman. He then takes on the role of Kinnikuman's second sidekick and is frequently seen with Meat throughout the rest of the anime. Nachiguron is bald when he first appears, but in the next chapter he has shaggy blonde hair which is his hairstyle for the remainder of the series. In addition to his cowardice, he is also a very loud snorer. He is named after the Nachiguro stones. He is voiced by: Keiko Yamamoto in Kinnikuman, and Naomi Nagasawa in Kinnikuman: Scramble for the Throne.
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