Enel

エネル

Enel considers himself an invincible god—quite literally. He believes he is a divine, immortal being with the authority to do, take, or destroy whatever he pleases. Consequently, he appears fearless, childish, and carefree. His lifestyle is relaxed and hedonistic; when not attending to his godly duties of smiting the natives of Skypeia, he spends his time sleeping or eating (apples are Enel's favorite fruit) in his residence, being waited on hand and foot by beautiful women. This attitude carries over to his battles, where he is hardly serious and barely annoyed. Instead, he remains relaxed, enjoying himself by effortlessly absorbing attacks and humiliating his opponents. In his fight against Kamakiri, he even went to sleep in the middle of the battle to prove his immortality.
Enel holds no regard for others' lives except his own and has no moral qualms about killing thousands; instead, he sees it as his godly duty and laughs as he sends Skypeia to its doom. He is, in short, completely insane, which was more or less undeniable when he set off for the moon, which he believes to be the home of God (himself). 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, he incapacitated him to remove him as a threat and reclaim his status as "invincible"—and from this point, he acts somewhat cowardly, trying his best to avoid another confrontation with Luffy.
Enel appears to possess a vast knowledge of mechanics and technology as well. He personally designed his flying ark, Maxim, and knows its inner workings inside and out; if any damage is done to the inside, he is able to repair it (assuming it is repairable). He was even able to design a stormcloud production system (known as Deathpiea), an electrical power system, and a Jet Dial failsafe for the ark, in the event that the main engines are damaged.