I recently unlocked Bowser's Long Range Fire Balls for his nB.
I like it. What are your thoughts on this move?
You trade the raw area coverage and klanking for constant range and useability. It's effective against anyone that doesn't have a projectile, or if the projectile isn't very good vs other projectiles but you aren't going to be forcing any campers to approach with just this, and the fact that it doesn't klank means you can't jump in with it to erase projectiles while also adding percent unless the projectile is specifically designed to be hit like a peanut or maybe a duck hunt can or clay pidgeon but even in those cases, the fireball's hitbox is way more precise than firebreath's and there is more room for error. The fireball isn't particuarly fast, and the hitstun isn't amazing, so you probably won't be getting any follow-ups unless there's a way to edge cancel or some other tech that can allow Bowser to act sooner out of it, this makes it much easier to approach, especially from the air. However, because it does not klank, it beats every non-disjointed attack that hits it, so Diddy kong's monkey flip kick, which klanks through firebreath, or Mario's Nair and Kirby's falling strike of final cutter, which both do the same, can be stuffed with the fireball. The same goes for recoveries which would normally klank the firebreath and make it back to the ledge. However, in the former case, there are often much better options to deal with attacks like those, especially final cutter, which you can easily punish with a kaw or bomb. For offstage, I think this might be where this special shines, because you can fire a fireball early before the opponent is actually in range so that if they continue moving the way they are, then they will bump into it, by the time they've chosen an answer for the fireball, you would probably have recovered then you could either fire again if you think it's appropriate, or you can try going offstage and taking advantage of whatever situation the fireball may have created for you. Keep in mind I haven't actually tested the fireball's edgeguard potential personally, but it seems like at least this much would be posible, and it would be a bit better than just a spurt of fire for similar effect because you wouldn't get as much stun out of it, or be able to start as early.
I suppose you could try to make a campy Bowser build using the fireball with dash klaw or dash slash then going with fast fortress and either slip or turbulent bomb since either would probably be fine, I suppose the turbulent bomb would synergize better with the aforementioned fireball edgeguard though, and dash klaw might be a little better than slash since it would catch people trying to powershield your projectile and get them out of your face, and of course, fast fortress would be useful for escaping pressure and reseting to neutral where you could go back to playing campy. I could see it working well for a more defensively oriented Bowser, but they might still prefer regular firebreath and either the normal and slip bombs over the other two, depends on preference, but that might just be customs in general. Anyway, hope that helps!