It all comes down to how much you want to spend on this game, but if you like opinion on what's the best thing to do now is to get Han, roshi is good if you have more bp, if not then han is a good choice, why han? removes buff, have super armor, (he is not immune to debuff). you can pair him with fu (jinchuriki), use sage naruto along with water main, you can get a easy f2p good team, or you can do han, roshi, sailor sakura, water main cancer team.