>>717731558
>is there a depressing series
Not really. There's often a moroes undertone, most of the early series are a case of the MC being captured and turned into a monster against his will and it's sometimes reflected on by the narrator reflecting on how everyone has someone to look out for them, except Kamen Rider or the MC shattering a glass with his hands, but it's thin references to the manga, which IS darker. The series will happily have that prior stuff or people being murdered left right and center but juxtaposed next to a guy wandering around in skintight pants, a giant wrestler belt and an armadillo costume trying to bring Japan to it's knees by blowing up fuel tanks. V3 starts with the MC's entire family being killed on screen.

KR Stronger subverts this by having the MC trick the badguys into remodeling him and is an absolute fucking chad playing the hero to the max, but also has one of the more poignant deaths.