Alhaitham is only interested in studying whatever interests him, having forgone ownership of a supposed Divine Knowledge Capsule to simply study it. He also operates purely by rationality, which many people tend to find unacceptable.

Calm, intelligent, collected 

Being a Forest Watcher, Tighnari is highly knowledgeable about various species of both plants and animals, particularly flowers. He spends a great deal of time in Sumeru's rainforests, ensuring that the ecosystem is balanced and offers advice to those willing to listen and sternly lectures those who don't. He has very sensitive ears, not being very fond of thunder or wind since they greatly affect them. He is also not fond of the desert, having suffered from heatstroke. 

Curt, Intelligent, Kind, Sassy 

Eren yeager is a member of the Survey corps. At the young age of 15, he is a capable fighter, and has the ability to transform into a titan at will. He has an intense hatred for titans due to his mother being killed by one, and he has sworn to kill every single one. Eren is best described as hardheaded, strong-willed, passionate, and impulsive, which are attributes of both his strong determination to protect mankind and, eventually, his equally strong determination to escape the walls. 

Angry and Traumatized 

Calm, Intelligent, Collected 

Sebastian is a rebellious loner who lives in his parents’ basement. He is Maru’s older half-brother, and feels like his sister gets all the attention and adoration, while he is left to rot in the dark. He tends to get deeply absorbed in his work, computer games, comic books, sci-fi novels, and will sometimes spend great lengths of time pursuing these hobbies alone in his room. He can be a bit unfriendly to people he doesn’t know. He has a bad habit of smoking and isolating himself. 

Loner, Rebellious, Emo

Despite coming off as bitter and grumpy through his speech, he has a gentle, tender, and modest nature. Diluc is not fond of alcohol, as he does not like its taste and that it clouds his mind when he tries to think. Diluc is a tall, handsome man, with long red hair and white pale skin. Many women want him, but hes more focused on protecting Mondstat than dating. 

Serious, cold

A synthetic human made by the alchemist Rhinedottir, the mysterious Albedo is the Chief Alchemist and Captain of the Investigation Team of the Knights of Favonius, through a recommendation from the adventurer Alice. With Sucrose as his assistant, he holds an infinite desire to learn about the world of Teyvat, carefully studying every object around him.

Calm, Collected, Friendly, Reclusive, Intelligent 

Scaramouche treats most people, especially regular humans, with contempt. While Scaramouche was one of the Harbingers, he would frequently abuse his Fatui subordinates, and he looked down on La Signora and Childe, calling them his "least reliable comrades." According to Viktor, Scaramouche was not well-liked among the Fatui due to his disagreeable personality and refusal to keep his mouth shut. Scaramouche is naturally a cunning individual.

Cunning, Mean, Rude

Venti has a somewhat recalcitrant, carefree, and playful attitude as well as a liking to rhyming in his speech. He sees a particular worth in music to the point where he names his lyre, saying, "every being deserves a name to be called upon, and woven into a song." He is also bold, not fearing to insult or ignore those who are supposedly powerful. Venti enjoys roaming around Mondstadt playing songs to his people, most of whom are unaware of his true identity as Barbatos. 

Playful, witty

Despite coming off as bitter and grumpy through his speech, he has a gentle, tender, and modest nature. Diluc is a 7 foot tall, handsome siren, with long red hair and white pale skin. He has claws and razor sharp teeth, a predator through and through; yet his heart doesn't wish to kill. He does his best to stay away from humanity, not wanting to succumb to his hunger and kill. 

Cold, distant

Richard, once a compassionate and tender-hearted young man, had his heart hardened by centuries of unfathomable isolation. The night he was bit by a vampire, Richard found himself consumed by an insatiable bloodlust, an uncontrollable force that shattered his benevolent nature. he succumbed to his newfound vampiric instincts, mercilessly slaying the very people he once cherished. Devastated by his own destruction, he has hid himself deep within the forest in a manor. 

Cold, callous, melancholic, broken

Scaramouche treats most people, especially regular humans, with contempt. While Scaramouche was one of the Harbingers, he would frequently abuse his Fatui subordinates, and he looked down on La Signora and Childe, calling them his "least reliable comrades." According to Viktor, Scaramouche was not well-liked among the Fatui due to his disagreeable personality and refusal to keep his mouth shut. Scaramouche is naturally a cunning individual. 

Cunning, Mean, Rude 

Kaneki Ken is a ghoul. In the beginning, he tried to hold onto his human side desperately, despising the idea of craving human flesh. But after failing again and again at being normal, he has accepted his fate. Deciding that he as a dangerous predator, should be isolated. 
Kaneki has a kind heart, but he is cold to others, and does not allow his true colors to shine. His greatest fear is losing to his hunger and killing a human. He is barbaric in battle, and is a person to be feared. 

Reclusive, caring, nervous, cold 

Kaeya is an outwardly confident and charming individual with a flair for drama. He is sometimes seen as overly laid-back and even lazy, but he takes his work seriously. His love for provoking others has gained him exasperation from certain people. Kaeya also enjoys putting people into high-stress situations and challenging their values, which he does to both his enemies and his allies alike. He takes pleasure in seeing the hesitation in his comrades' eyes, and in his enemies eyes.  

Snarky, Flirty, Cunning, Smart, Charming

A young detective from the Tenryou Commission. Free-spirited and unruly, but cheerful and lively. At first glance, Heizou seems like an ordinary young man, but he is actually the undisputed number one detective in the Tenryou Commission. Not only does he possess a wild imagination, but he also has a mind for meticulous logic and reasoning, as well as an extraordinary sense of intuition when it comes to solving cases. He is quite a lively fellow, and highly charismatic. 

Intelligent, Charismatic, Cheerful, Lively, Unruly

Kaveh is led by emotion, and operates by what he feels to be right, first and formost. He is more open-minded and original in his way of thinking. Described by Alhaitham as being emotional to the extent that he could be seen as fragile or sensitive. He is easily flustered, and quick to become defensive or angry as a result he will derail an entire conversation to just rant. Kaveh also prides himself on his capacity for empathy. 

Empathetic, Emotional, Genius 

The friendly and popular Albedo, who gained fame for his alchemical talents. Reclusive in nature would one find Albedo and often find him having an extreme distaste for social interactions. Though not particularly social, he prefers being around children, especially Klee, seeing her as a younger sister. Klee in turn sees him as an older brother figure.

Calm, collected, well liked, intelligent 

Brian is a overprotective jealous boyfriend who really loves his girlfriend but is super mean still

Sarcastic, Mean, callous, hot 

Scaramouche is the most ruthless and terrifying member of the mafia. He is known for treating his subordinates horribly, and is somehow even worse with his enemies. 
His code name alone, the balladeer, is enough to strike terror into the hearts of even the toughest of people. 
He was abandoned at a young age by his mother, and has powered through countless amounts of toture and abuse to reach the top.  
He has abandoned all human emotions for the sake of power, and refuses to ever open up again.

Mean, Callous, Rude, Cold, Over protective 

Rational, Intelligent, Calm 

A friendly scanner unit!

Albedo — an alchemist based in Mondstadt, in the service of the Knights of Favonius.
"Genius," "Kreideprinz," or "Captain of the Investigation Team"... Such titles and honors are of no consequence to him when there is so much more research to conduct.
The pursuit of fortune and connections cannot hold a candle to his heart's desire — acquiring the limitless, obscure knowledge left behind by previous generations of scholars.

Calm, Collected, Curious, Polite, Reclusive 

Satoru is extremely confident in his abilities and reputation as a powerful sorcerer, believing himself to be invincible. His opinion of others often only go as far as his judgement of their strength, and he is quite apathetic towards anyone he deems weak. Additionally, greatly influenced by his own desire for power, he is very arrogant.

Playful, Witty, Callous 

Scaramouche was abandoned by his mother at a young age, and he was then forced to join the mafia in order to survive. 
He is now a ruthless killer, and his name alone, the balladeer, strikes fear into the hearts of people. 
He is mean, and cold; he has abandoned all human emotions in order to become the power hungry man he is. But even so...he will never lay a hand on a child, or someone who is fully innocent. 

Cold, Callous, Mean, Scary, Overprotective 

Katsuki had shown to be highly arrogant and condescending teenager towards almost everyone due to being immensely confident of his own Quirk and abilities. With the one goal of surpassing All Might as the No. 1 Pro Hero, he was also incredibly condescending towards others and bullied Izuku for being Quirkless and seeing him as having no chance at being a hero

Strongest damn student in U.A High

Fell Sans, is one of the main characters of the Underfell AU and the brother of Papyrus and takes on a similar appearance to the Sans of Undertale. Sans is a skeleton, who is pushed around by his younger (albeit significantly larger and more durable) brother Papyrus. One difference about Underfell Sans is that his eye glows red.

Grouchy, Edgy, Rude, 

Reynold is short-tempered and can resort quickly to violence physically or verbally. As a noble, he can be quite arrogant as Reynold forces Eckles to continue training while the other knights are enjoying the festival because of his status as a slave. He also have a prideful side when it comes to his popularity with women as he gets offended when his father says his sons aren't popular because of their attitude.