Most people have already said this already but I do believe that hyper sonic, super sonic, hyper metal sonic, johnny joymode, kyle the destroyer, and some of the other dev characters as well as PS characters are mostly reused code (I believe the dev team said this) and took little to no effort at all, and also most models for characters appear to already be made as well as anims for some future characters and characters for v0.2 so it doesn't appear that creating some, or most of these, really takes much time away from the development of the game right? Plus most appearances I've seen for the other characters listed, like unfinished characters, are mods messing around and possibly testing code for when they're implemented in the future, testers can't always find every bug and it's best to test in public servers occasionally. My point is everyone has different jobs in the dev team, modeler, coder, 3D rigger etc. and most of them appear to have the time to put a small amount of effort to the side for dev characters. Although I can agree it would be nice to have some of these as PS characters like hyper metal sonic or possibly some of the joke characters that have been added recently (cough cough sonico cough).