Self proclaimed god of Sky Island, SkyPiea, after he dethroned the previous ruler. He holds the power of the Goro-Goro Fruit.
Enel thinks of himself as an invincible god - quite literally. He believes that he is a divine and immortal being, with the authority to do, take or destroy whatever he pleases and is capable of doing anything. As the result, he appears fearless, childish, arrogant and without a care in the world. His lifestyle is relaxed and hedonistic, and when not attending to his "godly duties" of smiting the natives of Skypiea (for speaking against him), he spends his time sleeping or eating in his residence, being waited on hand and foot by beautiful women. This attitude carries over to his battles, where he's hardly serious and barely annoyed - instead he's relaxed, and enjoys himself by effortlessly absorbing attacks, and humiliating his opponents. In his fight against Kamakiri, he even went to sleep in the middle of the fight, in order to prove his immortality.
Enel holds no regard for other lives except his own, and has no moral qualms about killing thousands - instead he sees it as his godly duty, and laughs maniacally as he sends Skypiea to its doom. He is, in short, completely insane, which becomes even more obvious when he sets off for the moon, which he believes to be the home of God (himself). Sometimes, against an annoying opponent like Usopp using his "Usopp Spell", rather then shocking them he simply bludgeons them with his staff.
Before Luffy showed up, his fruit power and mantra ability made his God-complex completely legitimate. Once Luffy began gaining the upper hand in the battle, Enel incapacitated him in order to remove him as a threat, and reclaim his status as "invincible" while stating that there is no need for him to fight Luffy - and from that point he acts somewhat cowardly, trying his best to avoid another confrontation with Luffy