Hello Id like to introduce you to Mugen a 2d fighting game where you can add your own chars and stages and figt with them I will give you download links so you can get started.
Tutorial -http://www.mugenfury.com/tutorials/aides/help.htm
Client=http://m-u-g-e-n.en.softonic.com/
Chars Stages
1-http://www.mugenation.com/
2-http://www.1emulation.com/forums/index.php?showtopic=6816
3-http://gcnmario.free.fr/mugen/characters.html
PS- Look for more downloading sites on google
PPS- Happy Fighting