Nevermind, found where to download it at. Where can I download those characters?

That's tricky, because the game itself is a actually freeware program that lets people create and add their own characters. [url=http://www.elecbyte.com/mugen]You can download the game engine here, but there are only one or two example characters to start. [/url] [url=http://mugenfreeforall.com/index.php?/topic/13305-to-aru-majutsu-no-index/]You then have to download the characters you want from a 3rd party, here's one of the To Aru Majutsu no Index sets. There are thousands more though from just about any series. [/url] [url=http://www.youtube.com/watch?v=PoQ69LcwIF8]Here's a tutorial to add the characters to the game.[/url] It is possible to play the game online against other people, but I don't personally now how to set it up. Same goes for music, stages and interface, if you have a small amount of programming knowledge or can find a tutorial online, [i]everything[/i] in this game is customizable.