Good move to ask here!
To give a bit more specific info…
Melty Blood should be run on PC rather than PS2 if possible. The PS2 version is not arcade perfect, and I think it doesn’t even have all the characters. Neko-Arc Chaos should be unlocked in case anyone wants to use him, he’s a joke character anyway. The main issue with PC is that you would likely have to provide USB adapters (with Pelican ones being the best).
SC3 has been taken care of, but I just wanted to reinforce the point that all the bonus characters should be legal. Heck, a Lynette placed 5th at Nationals. The VC issues are rather tricky, and you’ll find differing opinions - I’m not really a Calibur player, so I can’t add much more. =/
Guilty Gear has always banned Kliff & Justice, EX characters, Gold & Shadow characters, and Guilty Gear 1 mode. Also, I remember that console Slash allowed you to choose the #reload versions of everyone, and that was also banned. I don’t actually know if AC still has all this stuff, but just ban whatever from that list is still in.
Hope this helps out a bit, and good luck!