The character comes from his own manga series titled Perman, also by Fujiko Fujio.
Same as the original show Perman. Wearing a cape, helmet and a calling badge. He has a invulnerable suit which he uses in the comic book Perman - 251.
Mitsuo is like Nobita, is lazy but gets less zero in his tests than nobita, However, unlike Nobita he has cocky attitude and overestimates himself. His personality remains the same as a superhero as he tries to act brave, bold and courageous in front of others. Most of the time, he generally fails disappointingly in being one.
They were friends in the Perman series as Sumire Hoshino was Pako. They used to love each other in that series. Sumire carries Mitsuo's picture in her locket which see saw to Nobita.
After all, Nina is a big fan of Perman. Perman was also satisfied at getting her as a fan.
Perman's little sister.