This is one of the best Ideas for a devil fruit I've seen yet! I'm just trying to think of some weaknesses for it. I don't think just mere fire can affect it TOO drastically, and I don't understand how someone with superhuman strength is a "weakness" to something that's a liquid. My best guess for a weakness would be Fleet Admiral Akainu's Magma-Magma Fruit. It could damage a Liquid nitrogen person, but then again, the sheer cold of liquid nitrogen could harden magma into obsidian. So basically, if one overwhelmed the other, that person would beat the other. The Cryo-Cryo Fruit is, in short, a very very dangerous devil fruit with few weaknesses.
Aaaaw ! Thank you ! Well, in fact superhuman strength may be a weakness for Zack's fruit because he can solidifies the nitrogen ^^ Of course, fire/magma is the main weakness of it That's why I've write "fire" in the weaknesses Well, in fact I really don't want a really strong fruit, so that's why I've forced myself to put some weaknesses... I don't want Zack to be the strongest in the world, you know XD he's far from being a gary stu XD, but it seems that his fruit turns to be more powerful than I wanted XD (in the first place I was thinking of snow fuit, but short after the punk hazard arc revealed the fruit of monet...so.... I choose nitrogen, plus I think it is even more interesting to work on it in fact )
I'm very happy you like this fruit ! I'm very moved by the fact you were thinking about some things about my fruit ! I am feeling honored