mhikasa

Levi is described to be a "clean-freak" by those who know him on a personal basis, as he prefers his environment to be spotlessly clean.[4] He is averse to having either his person or his equipment soiled, and has been known to wipe down his blood-smeared blades while still on the battlefield.[5] However, he will not hesitate to touch filth if he deems it necessary. Instances of this include him rescuing a phlegm-coated Eren from the Female Titan's maw, and grabbing a subordinate's bloody hand as he comforted him during his last moments.[6][7] He is always seen wearing simple white cravat, which gives him an air of being "prim and proper".
Despite this clean-cut image however, Levi has an abrasive and unapproachable personality. His manner of speaking is rarely polite, and he often makes alienating comments that are coarse or inappropriate. His dark brand of humor, always delivered in deadpan, ranges from rude to outright vulgar. He tends to phrase things in a brash and insulting manner, and is not above provoking his opponents or belittling anyone who irritates him. This often unsettles people and makes him difficult to be around.[8] While Levi respects order, structure and discipline, he also seems to hold a disdain for authority and the status quo. At Eren's tribunal, he insulted merchants, calling them "pigs" and noting that the Military Police were unable of taking care of Eren.[9] It seems he also holds an open resentment for the Military Police, presumably for their constant interference and attempts to undermine the Survey Corps. At one point, he mocks them by stating that they have neither battled or even seen a single Titan, and suggests that they join the Survey Corps.[10]
However, Levi has a soft side, though he rarely shows it. One of his most defining characteristics is the great value he places on preserving human life. He himself has stated that he hates having unnecessary casualties, and advises his subordinates to properly use their judgement to avoid blunders that may cost them their lives.[11] When it was ultimately discovered that Titans may have once been human beings themselves, Levi appeared to be mortified by the news.[12] Because of his hazardous profession and personal values, he has come to care greatly for his subordinates' welfare. When ordered to make an early retreat to the wall during the 56th expedition, Levi was visibly frustrated with the fact that his soldiers had died for the sake of a fruitless mission.[13] He was also willing to resort to violence in order to save Eren from being killed at his tribunal, though he bore no malice towards him.[14][15] Levi was also shown to be greatly disturbed by the loss of his entire special squad, and risked his well-being for the sake of protecting Mikasa from the Female Titan, resulting in him sustaining an injury.[16] He has also stated that he carries the will of his fallen comrades, and that their collective grudge against the Titans gives him the strength to continue to fight.[6] While Levi shows loyalty and consideration for his comrades, he shows no mercy towards the Titans, slaughtering them indiscriminately with an obvious indifference. When dealing with individuals he perceives to be enemies to mankind, Levi's behavior can become sadistic, and even vindictive. A notable example is his bullying of the Female Titan when it was captured. Levi jeered at her, remarking that he enjoyed watching her suffer, and described in chilling detail how he intended to mutilate her human body.[17] Though Levi is aware that his battle skill is in a different league from almost any other human soldier alive, he is not particularly arrogant, as he knows through experience that no soldier can be invulnerable.[7] Few will argue with his claims that only he can handle certain difficult tasks, simply because they know his words are far from empty.[18] He also seems to have an independent mindset, as many of his hunts result in solo kills, with little direct cooperation with other soldiers (due to him usually assigning them to hunt other Titans in the vicinity)