The Kamo Kamo no Mi, Model: Platypus is a Zoan-type Devil Fruit that allows the user to transform into a platypus. The name is derived from kamonohashi, the Japanese word for "platypus", which in turn is derived from kamo, Japanese for "duck". And yes, TheShrubberyDemander is fully aware that the platypus and the duck are nowhere near close to related, but the name is really for simplicity purposes.
Strength and Weakness
The main strength of the fruit is the ability to transform into a half-platypus or full platypus. The user (if they're male) has ankle spurs that secrete a venom that causes an unimaginably horrible pain in humans that can't be helped for a long time, even with painkillers.
The user suffers from the standard Devil Fruit weaknesses. There are no other known weaknesses