Sewashi

Sewashi is a 13 year old boy from the future, who resided with Dorami. He is apparently a distant future "biological" cousin of Nobita, and is a secondary main character of the franchise.

Personality
Sewashi is energetic, athletic and always on the go, seldom sitting down or keeping calm. When he is sitting calmly though he is usually fixing either one of his ray guns or reading some science fiction story. Sewashi is also known to lose his head in dire situations, and panic helplessly.

Physical appearance
Sewashi is thin and has no muscular build at all, and is not well-built (according to Dorami he is growing to be a "malnutritioned child"). Sewashi's pale face contrasts heavily with his intense dark eyes and dark, thick, charcoal-like straight hair. He is nearly always dressed in a gray and yellow futuristic suit, thought sometimes he is seen wearing an orange suit with boots and gloves. He always carries a ray gun.

Ray guns and superheroes
Sewashi devotes his life to two main things: shooting with futuristic ray guns and Marvel's superheroes. Sewashi's aim has almost become as good as Nobita's and he protects his collection of shooting weapons like they were some sort of fragile baby living creatures.

Appearances
Sewashi had been a character for the franchise since the 1979 series, when he had a very minor role. Sewashi's role was expanded in the 2005 series, but he was considered a supporting character until 2015 where he moved up to be a secondary main character.