R&D Uchiha AU - headcanon that Obito was a different kind of nerd than the rest of the Uchiha so he couldn't find his niche, and he was just. SO. MAD. that someone like Kakashi could make his own jutsu like - "oh yeah, I've been working on this in my down time, it's a super-powerful one-hit kill technique." BAKASHI. NO. INVENTING COOL JUTSU IS SUPPOSED TO BE AN UCHIHA'S SCHTICK. But everything Obito comes up with is weird or unfeasible. My poor sad bby.
Given how Obito was in canon, I can see this actually being a thing. Maybe Obito isn’t good at inventing jutsus, but he’s one of the few Uchiha who’s able to actually use them in a fight because of his penchant for Xanatos Speed Chess the the ability to alter and recombine jutsus on the fly. He can’t create anything new, but give him a slightly wonky Katon jutsu, a half-powered Raiton, and a sluggish Doton and throw him into a dangerous situation, and suddenly you’ve got a volcano erupting underneath your feet and no idea how the fuck it happened.