Should I make a horror Sonic Манга или a high school Sonic manga?? или even a dark,evil one?

I would say horror, however that may not cultivate to the tastes of your complete audience. The reason for my answer is that 'high school' sonic can be very difficult to pull off in a completely understandable way (modern high school philosophy and Sonic-world reality just seem to clash). Also, I'm assuming that Ты meant 'dark, evil one' as part of 'horror Sonic manga', as the two seem to go hand in hand very easily.
Does this help Ты at all?

How about high school with a dark one!

Definitely a dark one cause that could be like sonics new rival ir something

A dark evil one, with dismatched eyes, blood and claws! Any color would be okay for Ты to choose from, considering Ты just need to pick from black, red, или blue. I think this might be a good idea! The name could be something creepy and unique

I think it should be a high school manga.