The Thunder Demon Straw Hat Luffy (A One Piece Fanfiction)

This is a story where Luffy ate the Rumble-Rumble fruit, a logia class devil fruit and became a lightning man instead of a rubber man. Luffy also showed signs of Haki at a young age so Shanks decided to take him with them to train Luffy. Godlike Luffy! More serious/smart...