Your arms and feet can become wheels!

Brown/Black Fruit Paramecia-type Devil Fruit

Passive. 

You double your walking speed when using your devil fruit power.

1st Level: Making an unarmed strike will deal an extra 1d4 damage

3rd Level: Making an unarmed strike will deal an extra 1d6 damage

5th Level: Making an unarmed strike will deal an extra 1d8 damage

7th Level: Making an unarmed strike will deal an extra 1d12 damage

10th Level: Making an unarmed strike will deal an extra 1d20 damage

15th Level: Making an unarmed strike will deal an extra 2d20 damage

18th Level: Making an unarmed strike will deal an extra 3d20 damage

20th Level: Making an unarmed strike will deal an extra 4d20 damage