How do transform in fairy tail vs one piece 0.5?

In "Fairy Tail," transformations often involve magical enhancements or the use of powerful spells, allowing characters to unlock greater abilities or new forms, such as Dragon Slayer transformations. In contrast, "One Piece" features transformations primarily through the consumption of Devil Fruits, which grant unique powers, or through training and the mastery of Haki, allowing characters to evolve their fighting capabilities. Both series highlight the significance of personal growth and the bond between characters and their abilities, but they approach transformations through different narrative mechanisms.