Personally I think Nintendo shoud take the Power Stone franchise and make it into an exclusive. Power Stone is not bloody or have hard core violence, which Nintendo likes, and it can be vastly improved upon since they haven't had a game in years. Ya Power Stone is forgotten but making this for the NX can really bring in new people since its not Street Fighter or Mortal Kombat it will be fresh and new in todays fighting game which also has different features than other fighting games that stick out. Co-op and Multiplayer won't be a problem and it just looks like a Nintendo game.
What fighting game would you like to see Nintendo tackle or perhaps make a new ips?