Due to the multiple layers of seals placed on Samael, he is unable to display his personality, but according to Ddraig, he has a strong hatred for Dragons. Issei also mentioned that he sensed various types of negative emotions such as pain, jealousy, suffering, and resentment from Samael.

Not much could be deduced on Great Red's personality, but Issei compared his personality to that of a biker gang delinquent, claiming that Great Red travelled around the Dimensional Gap doing crazy moves and got aggravated at people that were staring at him. History Similar to Ophis, Great Red was born in the Dimensional Gap from the "illusions" of "dreams". Not much is known aside from the fact that he soon took refuge there once Ophis left, becoming the counterstone maintaining that space since she changed from interacting with the Human World. Sometime before the series, Great Red was challenged by the then sixth Dragon King, Tannin, but ignored him.

Unlike the other Evil Dragons, Crom Cruach appears to be calm and quiet as he usually leans on nearby walls when on standby. He also appears to put his objectives first as, despite his love for battles, he was willing to leave after ten minutes when he was only told to hold off his enemies. He also seems to have a much greater amount of self-control since he backed down after Issei refused to fight due to exhaustion.[1] As noted by Vali, Crom Cruach is even more of a battle maniac than he is and spent all the years he was absent training between the human world and the?Underworld. Crom Cruach prefers to fight alone, getting angry if an outside combatant interferes with his battle. Outside of battle, he has a very standoffish demeanor, such as not repeating his words more than twice, and tends to not answer a direct question or order if he deems it to not matter, and will answer in silent response. Crom Cruach also has an extremely merciless side which is what earned him an infamous reputation as an Evil Dragon as shown when he ruthlessly brutalized Ni?hoggr after the latter attacked Ophis. Despite all of these traits, he has a honorable and respectful nature befitting that of a true Dragon, even though he is an Evil Dragon just like Apophis and Azi Dahaka, due to his hatred of dirty and nasty tactics and tricks as, during his intervention against Ni?h?ggr through the DxD Gremory group, he states that he will relentlessly and ruthlessly beat him up until his consciousness fades. Tannin also noted that out of all the Evil Dragons, he is the purest one despite being called the most evil out of all of them, because he lived for many centuries and Crom Cruach's eyes have seen many things including the vast changes in the history of the human world which, in turn, have changed Crom Cruach's views. His time in the human world has led him to prefer staying in his human form. He can also praise his opponents as he did with Fafnir and Asia for her bravery to stand against

Ajuka is a rare person among Devils who “creates”, preferring to create new things and claiming that it is one of his hobbies. Ajuka, however, doesn’t care much about his role as a Satan, focusing more on his hobby as a scientist and inventor over his job, and also has an easygoing nature like his fellow Satans. Despite this, Ajuka isn't irresponsible and will fulfill his role as a Satan when required, proven when he kills the Devils of the?Old Satan Faction?who threaten the peace of the current Devil society and create a method to defeat the Jabberwocky and Bandersnatch to protect the Underworld, he also tried to resolve political issues that Sirzechs couldn't handle. He also possesses a dry sense of humor towards his enemies, particularly from the Old Satan Faction, as he called "praises" all discrimination and criticizes what the Devils from the Old Satan Faction throw at him, and tends to mock his enemies if he deems them worthless. Ajuka values his friendship with?Sirzechs,?Serafall, and?Falbium. According to him, the only reason he became a Satan was because Sirzechs became one himself,[1]?as well as declaring that whoever became Sirzechs' enemies would become his, declaring this to?Shiva. After the three sealed themselves in the Isolation Barrier with?Trihexa, Ajuka resolved to shoulder their respective duties and watch over the Devils in their place on account of their friendship. He is a very kind and caring person, as he helps Issei and the Gremory team with their various problems, he also thanks and apologizes to Issei regarding the trouble Diodora has caused them. While Ajuka normally takes a lenient stance on politics, he is willing to interfere to prevent innocent people from being sacrificed in political schemes such as when he protected Riser and Ravel from the Great King Faction regarding the King Piece. Despite opposing the Old Satan Faction, Ajuka is lenient enough to show mercy to Tsufaame Tereaku Leviathan although he killed her when she r

Cao Cao is a charismatic and manipulative person, as he was able to convince many Sacred Gear users to join the Hero Faction either from their own will or by brainwashing them. He also believes that it is his responsibility as a descendant of a hero to destroy beings like Devils, Fallen Angels, and Dragons which he believes are threats to human beings. Due to being a descendant of a famous historical hero and being born with the Holy Spear, he believes that he was chosen by the world thinking that he is the hero of the world along with his comrades. Like his ancestor, he has the eyes to find people with good potential and considers them valuable talents. However, Cao Cao only accepts Humans with Sacred Gears in the Hero Faction and wants to see how far his faction can go against supernatural existences as he wants to test the limits of what humans are capable of. He is also cocky and arrogant, as he claims that he alone is enough to fight a god, and mocks opponents who are weaker. He tends to lose his control and composure when he is injured by someone unexpectedly or caught by unexpected unluckiness and things, as is seen when he gets infuriated when Issei hits his eye, and nearly loses his composure and self-control. Sun Wukong and Vasco still consider his views and abilities to be amateurish, childish, lacking, and still have some development. His cockiness would be his greatest downfall, according to Vali, as he refuses to kill both Issei and Vali, and put his objectives first rather than them at that time, thus allowing Issei to defeat him during their third encounter. But still, has some respect for those he deems worthy, those that manage to get his interest and he considers strong, such as Issei, Azazel, Vali, and Vasco. Like Georg, he tends to overthink things if some things do not tend to happen, the way he expects them to be, as is seen when he overthinks Issei's survival with the help of Great Red and Ophis. He also believes in fate, where he believ].

Yasaka is shown to be very humble and polite, as well as a loving mother and a dedicated leader. However, she also has a teasing and flirtatious side, as seen when she offered Issei the chance to have a child with her. Despite her flirty nature, she's seemingly unused to receiving gestures of affection, as she was briefly flustered by Issei's gift to her before recovering.

Irina is a cheerful, carefree, upbeat, and enthusiastic person. She is also shown to be cooperative and open-minded to others as she is seen with Arthur Pendragon discussing Excalibur Ruler, although he stated that the location is secret. She is a fiercely devout Christian, even more so than Xenovia, showing great respect for God's teachings. During her first appearance, she was very harsh toward

Kunou acts like a princess and responsible co-leader despite her young age. However, she still has a childish side to her. She tends to smile in amusement when she sees something interesting and things new to her sight as it seen when she is amazed by Issei's Scale Mail armor. Also, as noted by Yasaka, Kunou can also be obsessive, as seen when she protested against her mother flirting with Issei.

Asia is extremely shy, innocent and fairly inexperienced in things like socializing. As a former nun, Asia is a devout Christian, despite being reincarnated as a Devil, Asia still believes in God and follows his teachings such as praying to him and reading the Bible, which would usually result in her getting severe headaches. Asia has a strong kindness, even when she was still a human, she harbore

When Xenovia was first introduced, she was shown to have a calm, quiet, and serious demeanor, putting her mission first and only speaking when necessary. She was also very cold, bordering on heartless, as she called Asia a witch for becoming a Devil (even though she became one unwillingly so she could be with Issei) and even went so far as to try and kill her. She later threatened to do the same t

Ddraig's personality has changed a great deal as time has passed. At first, he had a great deal of pride in himself, though he admits that he had an intense rivalry with Albion, the other Heavenly Dragon. Since that time, he has become somewhat depressed because of the fact that he has become known as the Oppai Dragon and the Breast Dragon Emperor. Ddraig even requires counseling and medication be

Albion's personality has changed a great deal as time has passed. In the past, he felt lonely as a result of his poison and immense power, as no one wanted to come and challenge him. This changed as he met Ddraig, whose intense rivalry inspired him to become "a brave and fearless dragon on par with him." In the modern day, he has become somewhat depressed over the fact that he has become known as

Dulio is known to be a carefree person, and has shown to be quite lazy, as demonstrated when Michael ordered him to take care of any suspicious Grim Reapers, he ended up freezing all of the Grim Reapers because he couldn't be bothered to check all of them. Dulio has, however, shown that he was also a kind and easy-going man during his interactions with the Devils of Kuoh Academy. Having a great p

Tannin has a warrior-like personality and dislikes those who are lazy. Unlike other Dragons that are generally selfish, Tannin cares a lot for his fellow Dragons; willing to become a Devil both in order for his race to continue and to take care of his people in the Dragon mountain. Standing tall with a pride befitting a true Dragon, Issei sees Tannin suitable, true and worthy of his calling as a t

Originally a coward and a shut-in with a very shy personality, Gasper likes to wear female clothing, claiming that girls' clothes are cute. He also has a penchant for boxes, carrying one with him all the time. When Issei tried to give Gasper confidence, the former gave Gasper a paper bag to put over the latter's face. However, Issei comments that whenever Gasper puts the paper bag on, the latter l

Yuuto is overall an upbeat person and cares deeply for his comrades. He's also a very polite and friendly individual, even considering Issei's initial dislike towards him. As a Knight, he has pride, chivalry, dignity, and honor befitting one, and is shown to enjoy fighting fellow swordsmen like Karlamine. Initially, he had a deep hatred towards the Holy Swords or their wielders. But the efforts o

Rossweisse is known to be a very serious person, acting professional prioritizing work and study above all else since her youth, this however, caused her to miss out on romance, thus is extremely bitter and sensitive about not having a boyfriend and is quick to anger or sadness when made fun of. She has taken a liking to her role as a teacher in education for her students, making sure they underst

As a Devil from the House of Gremory[2], Rias is very kind and compassionate, especially to her servants and people close to her. She gets angry and violent whenever people insult her or her peerage, showing a fiery side to her. This also plays into the fact that she dislikes cruelty towards people, as shown with her disgust over Marius Tepes, who abused his own sister for his own benefit, and dxd