Toshi Toshi no Mi is shown to have a very straightforward power, allowing its user, currently Bonney, to add or subtract age to her own body or others. However, it also took an interesting turn of event during Egghead incident.
There, she attempted to take on the form of Nika while fighting one of the elders, I believe it was Saturn. However, she failed at first, and Saturn comments it being due to her not believing such future was real. But when she asks Luffy about it, and he tells her to be free, she succesfully becomes Nika.
So, this. What exactly are the bounds of Toshi Toshi no Mi, if it has any? She recreated the power of another Devil fruit with her current Devil fruit, and, judging by Saturn's words, she could do so if she believed it was possible.
Could she then decide to give herself futures where she can, for example, control and turn into ice, or turn into a leopard, or create candy on her skin? It seems her only real boundary is how much she believes it to be possible, but since she already proved she can emulate Hito Hito no Mi: model Nika by believing in a future where she is free, is there a reason she couldn't emulate any other Devil fruit that exists or doesn't even?
Is Toshi Toshi no Mi the most broken Devil Fruit in One Piece?
