Previously, as Wukong, he had a ruthless, apathetic and prideful personality, as well as a vicious, twisted and unpredictable attitude. Many gods and humans alike had viewed and feared him as a bloodthirsty lunatic and a war maniac, for he would wage wars and cause mayhem just for his own amusement. He began the First Heavenly War on the premise of revolution and freedom, but the true reason was his arrogance, since he felt the gods were looking down on him. He did not care for the billions of monsters he ruled over nor for his allies, being more concerned with satisfying his murderous desires. His cruelty is comparable to 666:Satan, who, according to the Gods of the First Heavenly Realm, doesn’t possess the same smell of violence as Mori. [1] Despite his erratic behavior during fights, Wukong maintained a calm demeanor outside of combat, internalizing all of his feelings and thoughts.

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Despite his willingness to sacrifice many of his allies, Mori had a somewhat kind side, as he refused to give Hephaestus a soul as one of the ingredients for his armor and was concerned to some degree about her severe wounds when he rescued her from the collapsed workshop.

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He was also very selfish and stubborn. He was unwilling to fight alongside others to the point where he would rather lose than ask for help. He also had a very dynamic outlook on life, as he would've had preferred to live a short but free and eventful life than live as someone else's servant. He considered that his own existence held no meaning- a belief that caused him to blindly chase strength in hopes of finding one.

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Mori's violent personality persisted after his defeat in the First Heavenly War and imprisonment for 500 years. It wasn't until he met Xuanzang that his aggressive personality began to soften. Mori adopted much of her teachings as a result of her influence- he became a much more merciful and compassionate person. He developed a protective attitude, believing that he had finally found his true purpose- to protect the one person he cares about. However, he was unable to properly express his emotions, which caused him to hurt the feelings of others and be misunderstood. Mori's experience of being forced to eat Xuanzang alive in order to survive left him with severe trauma and guilt as well as a deep hatred and fear of Tathagata.

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As he took the identity of Jin Mori after forgetting his previous one, parts of his behavior closely resemble Xuanzang's to uncanny degrees. He is playful, straight-forward, loyal and is wiser than he appears, but he can also be very immature. He has incredible instinct, he's quick-witted and a genius who can pick up different skills with ease. Despite being unable to recall anything, he was always aware that something felt wrong about him, that something was missing, but always tried not to think about it and hid from the truth. 

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He is still capricious and preference for fighting alone remain, as he dislikes the idea of borrowing power from others. His extreme arrogance remains a dominant trait, subconsciously deeming everyone as below him and underestimating them. Despite this, his good nature shined when he knocked down Gang Manseok after witnessing his excessive violence, despite knowing that he would be disqualified from the tournament [2] and according to Mira, Mori would have withdrawn immediately if he had known Daewi was fighting to save his friend, [3] albeit this was before Mori had an actual reason to participate in the competition, so he did not mind being eliminated.  It was only after hearing of Jin Taejin's dissapearance that his desire to win gained a desperate weight to it.

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Mori, while good-natured, was not a gregarious individual and was rather pretty lonely. Before meeting Mira and Daewi, his only social connection was with his grandfather, Jin Taejin. He called Mira and Daewi his friends before, but it wasn't until they showed up at his door to celebrate his birthday that he realized that he had actually made genuine connections. [4]

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He rarely expresses anger, but when he does, he reveals his merciless side as he beats up his opponents with an expressionless face. He does not care what others think of him or his actions, as everything he does is for his own satisfaction or to help him further protect the ones he loves. He is highly observant of others, immediately noticing when someone is lying, acting or is mentally/emotionally unstable.

He usually avoids killing those he doesn't personally dislike, but he is unable to symphatize with others, unaffected by the deaths and suffering of people who are not close to him and will not hesitate to kill his opponents if they pose a threat to him. In death battles, Mori is a very cruel fighter, often killing his enemies in very brutal ways. He still has the habit of smiling maniacally during some fights, originated from his Wukong days. 

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Mori expressed hatred and disappointment towards his past self's behavior after regaining full memories of his life as Wukong. He was angry at himself for needlessly sacrificing his loyal allies and resolved to make amends, but limited himself subconsciously in an attempt to reject his identity and the emotional baggage that comes with it. He no longer rushes fights, instead assessing the situation and setting priorities first. He becomes more protective of his friends, immediately dropping his playful act and resorting to violence and intimidation if their safety is threatened.

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His self-blame and hate grow as he is unable to protect his friends during Ragnarok and eventually feels that he has lost his purpose in life for the 2nd time with the death of his grandfather, disappearing for 17 years and nearly letting himself die.

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He considers himself an awful, despicable existence. Failures drive him into severe anxiety, fear and self-blame, and make him experience recurring nightmares about his past traumatic experiences. He has a tendency to hide his true feelings, as evidenced by the fact that when informed of Jin Taejin's disappearance [5] or the possibility of Tathagata's revival [6], he pretended not to be concerned in front of others, but was later shown to be deeply shaken when alone. He always tries to discard his "weak", "wretched" self by acting as though everything is fine until he eventually mentally exhausts himself. As he closed off his heart, almost never lets anything get revealed about himself or his true feelings and usually avoids topics regarding his past experiences, very few people have actually witnessed his behavior whenever his façade fell. 
 

Due to the fact that he failed to defend his loved ones before, he strongly believed that he is worthless and a coward despite his great power. Hearing about Tathagata's possible resurrection made him fearful as he wouldn't be able to cope anymore if he lost anyone else he holds dear. Despite having a terrible fear of dying, he would confront any life threatening situation if it means it would make his existence worthwhile in his eyes. This fear is usually overshadowed by an even bigger fear- having to flee from everything once more in order to survive and ending up watching as the things he wants to protect vanish before him like they have several times before.

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As Dan Mori, he appears quite cheerful and carefree, but he is actually very responsible as Dan Ahan's legal guardian and older twin brother and is also capable of adopting a more parental tone with her when necessary. It is later revealed that "Dan Mori" was just a mask Mori used to hide from himself, his guilt, self-hatred, and pain, as he forcefully repressed his memories whenever the thought that he was Jin Mori surfaced in his mind. Like Xuanzang and Jin Taejin, Ahan became his reason for living. After the conflict with Jung Mori, he made the decision to face himself. As a result, he became much more composed and mature, even going back to a similar quiet demeanor he had as Wukong. He has excellent emotional restraint and doesn't allow his feelings to overwhelm him. He slowly confronted his own emotions and became a little more accepting of his flaws, leading him to better himself both physically and mentally. At the same time, the more he looked at the bigger picture, the more he acknowledged the existence of fate.

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Despite his development, he harbors such a deep hatred for Mubong that he would even let himself and others die if it meant the end of him. His thirst for vengeance drove him to wage war against the world, brutally taking the lives of two Generation X teenagers and nearly killing a crowd of civilians.

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He accepts himself, his feelings and his identities, as well as the emotional burden that goes with them, as he realizes that everything that has happened in his life has served a purpose. He resolved to not run away from and discard himself again, even if he knows death is what awaits him at the end of the road. He understood he is not alone and should not fight by himself, as everyone has his back. He sorts through his emotions once again and despite not forgiving him, he no longer harbors any ill feelings for Park Mujin.

He acknowledges not only that the cross he carried was a salvation, not a stigma, but also that everything has a purpose in the grand scheme of things, hence why he no longer hates or loves his enemies, but simply understands their purpose and reasons, nothing being without a meaning. Purifying the world of malice as an act of ablution made him reach an absolute state of existence, becoming the world itself. He finally loves himself as he loves everyone else. He is a paradox that is both selfish and selfless at the same time.

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He has made it a priority to maintain harmony since becoming the Absolute God Maitreya. Although he is aware of and can resolve his loved ones' problems, he does not allow himself to make exceptions in the system. However, he knows that those issues will be resolved in the future.