Kōkan Kōkan no Mi

Kōkan Kōkan no Mi is a Paramecia-type Devil Fruit that gives you the ability to trade your body and your Haki with others, simply by sensing their presence.

Body Trade
This is the ability to trade bodies with someone else, this can be useful in many ways as well as in battle as the user can trade bodies with his opponents if he is heavily injured or poisened, when the consumer trades bodies with someone else using this ability they will both maintain their own Devil Fruit powers and Haki.

This trade is only temporary and then the user would automatically return to his body after a short period of time, if his body died while in the possesion of someone else, then he would die as well, which also applies on the person the consumer traded with, which means this ability can be used by the consumer to take down an enemy along with him if he wants to no matter how strong this enemy is.

Haki Trade
This is the ability to trade Haki with someone else, this is possible because Haki is considered a sense, this be very useful against opponents who have stronger Haki, the consumer of this ability can even gain types of haki the he doesn't have through this ability, like Haoshoku Haki.

Like body trade the effect of this ability is temporary.

Weaknesses
The only weakness of this ability is the risk of trading bodies with someone else. Other then that the consumer suffers from standard devil fruit weakness.