Sonic Mania Plus is a amazing addition to an already amazing game, with it we got two new characters. Mighty the Armadillo and Ray the Flying Squirrel. That makes for five characters, Ray feeling like Tails' counterpart and Mighty feeling like Knuckles' counterpart, but then, they left Sonic all alone. What I'm trying to say that....How about make it six? I would personally love an update to Mania Plus, or another small DLC for 1$ or 2$ that adds in Amy Rose/Rosy the Rascal! I think it would be a very nice addition, seeing as she wasn't playable in any of Classic Sonic games, except few spin-offs, and many people will agree with me! So. TLDR;

Add Amy Rose into Mania Plus or make her a DLC costing 1-2$

(Edit showcased in the thumbnail is made by Missholoska!)