If he had a Paramecia Devil Fruit on hand, Mousse could surely unravel another large part of the mystery.
Unfortunately, every Paramecia Devil Fruit the family acquired was assigned out as soon as it came into their possession, leaving none behind. Unlike Zoan Devil Fruits, there might be one or two that had yet to be sold and were temporarily kept in storage.
For example, the Zoan Devil Fruit Mousse had borrowed for his experiments was practically useless. It was even an Ancient Zoan, which should have made it quite valuable.
But the problem was that this "Mongoose-Mongoose Fruit: Kangaroo Form" was not even as powerful as many ordinary Zoan Fruits. Price it too high, and no one would buy it; price it too low, and they would feel they were taking a loss. After all, it was still an Ancient Zoan.
As a result, the Devil Fruit had gathered dust in Cake Castle's treasury ever since it had been seized, only to be dug out after the prisoner-killing incident, when the family urgently needed to liquidate assets for funds to buy Devil Fruits that could better increase their strength.
Even then, it failed to sell at its first auction, which was how it ended up in Mousse's hands as an experimental subject.
Yet this Devil Fruit's fate changed because of that. While making use of discarded material for his experiments, Mousse suddenly realized that this Devil Fruit seemed like a perfect match for the King's Fist. Kangaroos could box just like humans, and in some respects, they were even better suited for it.
In other words, after eating this Fruit, there would be no need to transform into the so-called "human-beast form." In beast form, one could directly warm up and unleash the King's Fist, gaining more vitality, stronger