Kame Kame No Mi

Name: Kame Kame No Mi (The Tortoise Fruit)
Type: Zoan
Capabilities: The Kame Kame No Mi, like all other Zoan fruits, grants its eater with three different forms:
Original Point: In this form the user maintains his normal appearance and powers. However, the user becomes slower than he was before eating the fruit, and eating any non-vegetarian food is likely to cause some stomach issues to him.
Tortoise Point: In this form, the user fully turn into a tortoise. His size shrinks into that of a small tortoise (About 30cm long, weighting around 3kg). At this form, the user gains a strong protective shell that he can retract his limbs and head into, and a pretty impressive bite force considering his size. Much like other zoan fruits, the user's clothing disappears when he takes this form, with his shell gaining their colors. In this form, the user gains a terrible weakness: If turned upside-down and placed on his back, it's impossible for him to turn himself back up without outside assistance.
Hybrid Point: In this form, the user becomes a mix of his original and tortoise forms. He gains a strong turtle shell on his back and front that is large enough for him to retract his limbs and head into, and similar shell-plating on his hands, feet and head for extra protection. His skin turns brown-green and wrinkly, and his shells increase his weight ten-fold, making him slower than before. The transformation is accompanied with increased strength to match his current weight. This form carries over the Tortoise Point's weakness.

With practice and experience, the Kame Kame No Mi can grant the user with more transformations (both partial versions of the basic ones and entirely new ones) and more tortoise abilities.