i have a new AU! It's called "old vs new". I took some inspiration from Bendy and the ink machine. the plot is that Derek,Trevor,N,Uzi, Phoenix wright and miles edgeworth were asked to go to an abandoned Animation Studio from an anonymous letter. they enter the studio to find it in ruins. they then find adrien who is just standing there. but when Trevor tries to talk to him Adrien is not same person he was. his mouth looked like it was melting and his eyes were.. wrong(like the eyes scooby has in this picture). adrien then attacks the group but Derek manages to fend him off. it is revealed that the studio they entered was where old and somewhat new(early 2000s-2010s) Cartoons and video games were made and something went horribly wrong causing the cartoons/characters to become Tainted beast.
anyway Scooby was one of the good old cartoons made in the studio, and with the help of a special ink. the studio brought scooby and the to life! the public loved the Scooby doo cartoons. but as the years go by Scooby doo became less popular as New Cartoons were being more popular then the old ones. so in order to keep up with the new cartoons. the studio began to harvest the old cartoons to make new ones. Scooby slowly began to lose his friends, and he even lost his best friend shaggy.
but before Scooby could be harvested, a toon named Carlos(from the magic school bus) Killed the animators and started a massacre in the studio. Scooby was in bad shape, but carlos saved him in return that he served him and make Every new toon/character pay.
after several years of seeing carlos descend into madness, Scooby escaped his grasp and now roams the Studio depressed, sad and alone. he gets visit's from martha and courage, but nothing can fill the empty void of sadness in his chest since he lost the ones he was very close too.