What is the most DEADLY normal Zoan fruit? Meaning no Mythical Zoans or anything like that. And it doesnt have to exist, you can make it up.
I personally think it would be something like Gero Gero no Mi: Model Poison Dart Frog. The poison dart frog's are super deadly, the can badly poison you just by touching you, and can shoot poison darts. The user of this fruit, it their hybrid form could jump really far and have super strong kicks.