idfk any anime stuff, but my grandpa is literally like wut you said is what grandpas are in anime, this man built a plane from a lawnmower engine and flew it around the neighborhood as a 17 yr old, and it even took 3 grown men to hold him back from beating the shit out of a guy that hurt his dog last year. EDIT: he's in his 80s, I inherit a lot of strength from him and my dad.