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Maou possesses genius-level intelligence, perfect memory/recall, and a limitless capacity for learning.  He was able to piece events together and deduce a logical and correct conclusion with relative ease, such as when he figured out Lucifer's motivations for the mugging incidents around the neighborhood to accumulate power without much information. The best example of his intelligence is how he was able to nearly conquer Ente Isla, with the education and knowledge he learned and memorized 300 years prior to the story (which was a feat unrivaled by any in history).

He possess a limitless level of intellectual (memory, calculation, learning, creativity, IQ, etc.) and cognitive (observing, deduction, tactical analysis, multitasking, combat, movement, etc.) proficiency that is of the highest level in existence, essentially a limitless IQ and intellectual capacity.  His mind works in the same way as a hypercomputer, he possess unlimited information storage capacity, he is able to perform infinite mental functions and multiple physical functions at once without stress, difficulty, and losing focus on any of them. He can instantly recall specific information with incredible speed and perfect accuracy. He is able to store everything that he experiences and retrieve it immediately without the typical human pause for thought. The speed of his thoughts augments his analytical ability so that he is able to make snap decisions about his surroundings and create complex scenarios at high speed. As such, Maou is able to track the probability of an event by piecing together stored data.

Maou is able to perform multiple tasks at once by allocating a partition of his brain to each task. For example, he can use his mind to replay a movie he had watched previously, play a game of chess, figure out the best way to improve McRonald’, do his jobs, teach Chiho, and make plans on conquering Ente Isle without any one task distracting him from another.

He is capable able to understand, utilize and duplicate any knowledge/skill after observing or being exposed to it even once. He possesses a mind and instincts which can process the world in the most advance and efficient manner. He is able to find any solutions to any and all kind of problems that faces civilization, natural, etc., using both the logical and illogical sense and strategies. He possess endless vitality, virility, sense of humor, willpower & will to live, he never gets bored of life does not feel guilt or regret, and very quickly recovers from fear and pain as shown he is living life to the fullest regardless of how much time has passed, how much suffering he has witnessed, or which world he is living in, he always makes the best of his situation, in his own words he is "Mr. Nice guy."

This intelligence also expands to his exceptional leadership and adaptability. His overwhelming charm, charisma and eloquence allows him to attract all kinds of demons, enemies, and people to work together and follow him, or make friends on Earth. He also has exceptional tactical, political, diplomatic, legal, business, military, observational, deductive, analytical, calculative, and economic skills. These skills make it easy for him to naturally attract, gather, produce and control any and all resources, as well enable him to be able to intuitively utilize them to the best possible level to reach his goal, allowing him to succeed in any situation (from winning battles, governing his empire, to winning games, improving MgRonald). His intelligence remains the same regardless of his form