Mame Mame no Mi

Sensui Sensui no Mi (Submerge Submerge Fruit in English) is a Paramecia devil fruit which allows the user to submerge themselves anywhere.

Powers
The user has the submersible ability of a submarine, and can dive underground or inside of human bodies. With enough practice, they can submerge themselves in clouds.

Weaknesses
The user cannot dive under seawater. Other than that, standard Devil Fruit weaknesses apply.