SureWell I was thinking a huge plot woth most of the characters and villains from most of the series.
Like characters are spread out across different cities and Eggman is planning his biggest attack yet. Collecting (and succeeding at) all the chaos emeralds which in turn allows him to release villains and monsters throughout each said city the sonic heros are in. Then I though maybe it could be a big rp with characters fighinting and helping each other. Idk just an idea and after maybe sonic or shadow (assuming he's good) getting the final showdown with Eggman.