One Piece: How Strong is Rob Lucci?

gamerant.com:

In One Piece, the World Government is a powerful entity that controls most of the world and finds itself in perpetual battle with pirates. While their primary military force is the Marines, they also have 10 known Cipher Pol units which have different specialties. The secretive CP9's members are all assassins, and are the major antagonists of the Water 7 and Enies Lobby arcs. While they are led at the time by Spandam, the strongest among their ranks is the cold and callous Rob Lucci.

After his defeat by Luffy at Enies Lobby, Lucci left CP9 along with Spandam and another member, Kaku, and joined CP0, the World Government's strongest Cipher Pol unit. This signals his strength continuing to be held in high esteem by his superiors despite his failure at Enies Lobby, and it's strongly implied his strength has increased since he fought Luffy. But how strong is he?

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In battle, Lucci relies on two main sources of power. The first is the Rokushiki style of martial arts, which entail six superhuman techniques every member of CP9 except Spandam have mastered. Lucci exceeds his comrades in his use of most of these techniques, and is the only member shown to use a secret seventh technique, the Rokuogan. He uses this technique by placing both fists against his opponent and emitting a massive shockwave. Lucci, like his colleague Kumadori, also is capable of enhancing these techniques using Seimei Kikan, or Life Return, a technique which allows him to control every last part of his body down to the hairs on his head.

In addition to his use of Rokushiki, Lucci ate the Neko Neko no Mi, Model: Leopard, a Zoan Devil Fruit which allows him to transform into a leopard. Most Zoan Devil Fruit users are