Ultimate ninja storm 4 has a ton of fighters over 100 of them. Once you get inside the store you need least.
You cannot simply unlock the costumes from the ryo store you need to purchase it from the bandai general store which can be found under collection.
Naruto ultimate ninja storm 4 how to unlock costumes. The first is having enough ryo the currency in the game along with the correct amount of corresponding ninja treasures to be able to make the costume. You get to the stores via the online battle or collection menus which let you reach the general store and ninja treasure exchange respectively. And like most fighting games there are alternate costumes you can obtain for many of the characters.
Certain dlc costumes can be unlocked by completing story mode. The costumes are handled very differently though as they actually must be bought in game. Ultimate ninja storm 4 on the playstation 4 a gamefaqs q a question titled how do i unlock naruto and sasuke the last costumes.
Buying costumes takes two prequisites.