Haha holy shit, I just had the funniest idea. Detective Conan but reversed.
Ran is at Tropical Land with little Edogawa Conan, he’s a neighbor kid who’s author/actress parents are often out of town so she agrees to keep an eye on him. Edogawa is already making a name for himself as an elementary school student with a knack for detection (though nothing on canon Shinichi’s level, think a bit above the Shonen Tanteidan). He spies some bad guys at Tropical Land and chases after, is bonked on the head and forced to swallow poison when, amazingly, he’s turned into a teenager.
He runs back to his primary guardian, Professor Agasa now as a 17 year old. He and Agasa are trying to figure out what happened when Ran shows up, scared out of her mind about where lil Conan went, and finds an absolute hottie. Conan panics and says his name is Kudo Shinichi (”’One Truth’, really Conan-kun” Agasa later says dryly). Ran is quickly smitten with the handsome, awkwardly and eerily familiar teen boy. Agasa says Conan has returned with his parents to America but his er cousin? yeah sure cousin is going to stay and watch the house for a while.
Conan has always been mature for his age so he decides to continue hiding as Kudo while he investigates the Black Org but, on the inside, he’s still a 7 year old. He pretends to be homeschooled but stays at home and perfects the art of detection and how to be a semi-normal adult. He follows Kogoro around to learn about detection and quickly realizes the older man lacks insight, they work together and make a name for themselves getting bigger more public cases.
Shinichi is overly simplistic and comparatively childish compared to an adult, he draws wild conclusions and doesn’t know basic adult facts but he’s cheery and has a passion for mysteries drawing people towards him. He’s very scared about people finding out who he is and does his best to act like an adult but still maintains his childlike optimism.
The series revolves around the strange Kudo guy stumbling through murders, learning bit by bit and slowly getting sharper and smarter and more efficient. He misses his old friends, the Shounen Tanteidan and hangs out with them as a ‘mentor’ as they work on cases together. Conan always had a puppy crush on Ran which is now more complicated by Ran falling in love with his fake identity of Shinichi. Heiji IDs Shinichi as a fake right away and soon learns the truth, feeling bad for nagging on a kid and recognizing burgeoning talent, he becomes a friend/guide and finds genuine friendship with a kid nearly half his age. I haven’t decided if its funnier for Ai to go from small to big like Conan or for Ai to be a shrunken adult and have towering Kudo Shinichi kneeling down deferring to her judgement.
Basically its DC but a lot more wholesome and hilarious as little Conan tries to navigate a big world.