Kuma is a pretty tough bear, but I don’t think he will really be able to do a whole lot against Bass. First off, Bass is faster than light. This means that none of Kuma’s attacks have any hope of actually hurting Bass because he can’t be hit. Bass also has enough power to destroy the whole universe. How can Kuma hope to dodge or block that? The simple, but accurate answer is that he simply can’t. This is an unwinnable battle I’m afraid. Bass wins.