Chika Chika no Mi

The Chika Chika no Mi is a Paramecia-class that enhances the user's physical capabilities to their absolute limit, transcending all others in physical might, putting them on godlike levels, and transforming them into a Might Human (勢人間, Ikioi Ningen).

Its current user is Soma Kratos, the "physically strongest" of the Gothic Labors, known for his alias as Heracles (ヘラクレス, Herakuresu) — a parallel to his nearly-unmatched physical might. He won it in Dressrosa as recognition of being one of the nation's strongest Gladiators, before his eventual departure.

Appearance
According to Kratos, the Chika Chika no Mi is one of the few Devil Fruits that deviates from the standard Devil Fruit appearance — looking like a vegetable. He raised an uproar about the prize given to him, believing he was ripped off for his years of service; his assumptions was laid to rest after officials showed him the picture of the Devil Fruit in the  (悪魔の実図鑑, Akuma no Mi Zukan?), which even Kratos has heard of.

All he remembers about the "fruit" is that it resembled a head of lettuce with swirl and brick-like designs covering its surface. In addition, when he ate it leaf by leaf, he commented that the fruit tasted like medicine that a kid would spit out because of its sour and grimy taste. Regardless, he felt his physicality reaching its utmost limits after full consumption.

Overview
"There's a reason why I'm physically the strongest amongst the Twelve Labors. Don't believe me? Let me show you what I mean."

- Kratos moments before displaying his Devil Fruit power.

Trivia

 * The purpose of this Devil Fruit is to maximize the use of physical strength, playing into the theme the author has set for its user.
 * The absolute physical capabilities granted by this Devil Fruit stems from beings like Superman from the DC comics, Saitama from the anime/manga series, Onepunch-man, and both Hercules and Kratos from Greek Mythos — the latter two being strong origins for the character.