☈ Food first : Of course, it is important to note that Neuro, though as complex as he is, operates on the basic biological instinct of finding food. He comes to the human world for the sole reason of finding more mysteries to consume. Though he and Yako are similar in the respect: they both eat food not only to survive, but to also "be happy". He wants quality of the mystery, not quantity. While he would be happy with any mystery, he doesn't like tiny fodder - he deems it an insult to his vast intellect.

☈ Abusive Demon & Troll of Yako's life: While on the outside, he acts like an obedient servant boy to Yako (puppy dog eyes versus the TERRIFYING ABYSS THAT ARE HIS REAL EYES), Neuro only knows how to abuse Yako. Whether it be through terrorizing her by taking apart her cellphone or making her hold up a melon while he demonstrates a decapitation or slamming a book on her head for ignoring his ~*~brilliant analysis of human TV~*~, it seems to be the only way he knows how to communicate. An interesting fact is that while he does call Yako "sensei" in public, he often passes his own opinion of things in the form of "Sensei says..." in order to make all the blame form on Yako. His backhanded trolling is very important because he can't draw attention to himself in the human world. And if it means that Yako gets extra trolled, it just proves how brilliant he is for executing such a perfect plan.

☈ Cruel Bird: While Neuro does seem more focused on technical things (read: more superficial) in the human world that lead to his apathy about people, there are some contradictions. Those come in the form of those who threaten Yako's life or those who threaten the lives of people around him and WHO DARE TO ATTACK HIM. Those suffer the fate of having Neuro using one of his 777 Tools of Makai Realm. One stalker had his nerve endings played as an instrument, another (Yako's father's murderer) entered a nightmare of his own design. Neuro is a cruel being and he doesn't really hesitate to punish he deems are worthy of it.

☈ FRIEND?!!: Abuse aside, Neuro and Yako are really a team. Whilst Neuro figures out the technical aspect of mysteries, he leaves Yako to the motives. While he disguises the fact that he actually gives some sort of inclination to Yako's growing ability, he wants to see her grow. When Sai brainwashes Yako, he immediately gets irate that someone is infringing on his "property". Another example would be with the case of Aya. He knew that Aya was the killer all along, but he let the case develop when it was apparent that Yako was doing research. After the case, he praised her and went off on his way - not before threatening to rip her limbs off if she didn't show up. It's hard to say that he actually "cares" on the level that humans "care" for something, but the "slaves" around him are very important to him.

☈ Anthropologist: There are just some things that a demon of hell can't comprehend. Whilst he jokingly makes comparisons ("Oh, your dramas here stretch out for so long. In hell, in ten minutes everyone dies and we just film the corpses"), there are things like "intuition" and "feeling" that he just can't comprehend. While slowly, he starts to understand, he needs Yako and Godai to not only keep his cover, but to help him out by discovering motive so that he can devour mystery. There are times where he would just sit and watch, but there are times that he would just point out how backwards humans are.

☈ X( don't piss off Neuro: Seriously. Don't piss off Neuro. He won't care how many people die in the process, but if you harm his food source, you're fucking dead.

☈ DEMON BIG BIRD: It's important to note that Neuro does hold a true form of a giant bird. Whilst he jokes that he can't fly (which is probably false), he has the mannerisms of a bird. For instance, his gloves make it seem that he has five fingers, but he really only uses three. His middle acts as an index finger and his thumbs are on either side. He also tends to view things from the point of view of an avian such as "nests", "preys" and so on and so forth. Probably best not to use bird puns around him.