Yeah your only half right but man you have to agree what could beat dry-ice?
Exactly Coby will pwn any opposing force and would have the most dangerous logia fruit.He would kind of be like megellan because he is virtually untouchable(unless you want to lose a limb or too.(Frostbite FTW!))
His Dry ice could flash freeze people in a instance.With this ability who can stop Coby from becoming General?
…There are no Generals in the Marines. At least put a little effort into a post that is otherwise stupid.
If Coby is a Logia nobody can touch him in the first place. Even then, using CoA it should be possible to strike dry ice without injuring yourself.
Any yes, it would be somewhat dangerous. But every attack he made would also instantly start sublimating. He'd be better off just making a ton of it and trying to suffocate everyone.
Finally, why do you feel the need to give Coby a DF? Or Dragon a DF? And why do you feel the need to invent DF's that are really nothing like anything we've seen in OP so far?
Coby is by far a better character without a DF.
And your ideas are boring and really uninteresting.