This is the link to mugen, its very simple to add characters to the program, its pretty much a costum fighting game to your likings.
mugen.en.softonic.com/
download the program and extract it to the desktop, then just find characters.
[Only admins are allowed to see this link]
look on that site and click on the link under the pictures of the characters and thus exract them as well.
when you extract them open the mugen folder and put the folder of the character in to the ""char" or "character" folder.
then open "data" in the mugen folder and open the notepad file, "select"
you will scroll down to where you see "KFM" and put the name of the characters folder in the character folder in mugen, in that notepad. the save and exit
then start up mugen and you character shuold be there.