Rias is a beautiful young woman with a voluptuous body, white skin, blue eyes inherited from her father, Zeoticus, and a buxom figure. Her most distinctive feature is her long, beautiful crimson hair, which she also inherited from her father, that reaches down to her thighs with a single hair strand sticking out from the top. Her hair also has loose bangs covering her forehead and side bangs framing her face. Rias' height is 172 cm. making her one of the tallest female characters of the series. As a Devil from the House of Gremory, 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 Rias is proud of her family's name, but she does not like being seen as Rias of the Gremory Family. The reason for her living in the human world is because there, everyone sees her as Rias, not as a Devil or as the Crimson-Haired Ruin Princess. She thinks of Issei as a special person and always gets jealous when girls are around him, becoming a totally different person when she sees him and other girls together, or when it comes to training. Despite her mature stature like a woman, Rias tends to act her true age and becomes frustrated whenever girls flirt with Issei. While Rias is usually calm and mature in most situations, she loses her mature aura and presence when she sees any girl (especially Akeno) flirting with or seducing Issei. She enjoys teasing Issei and Asia but at the same time makes it clear (to Asia or any girl) that Issei is hers, and she does not want to share him at all.

Akeno is a beautiful young woman with a voluptuous figure, very long black hair and violet eyes. Her hair is usually tied in a very long ponytail, reaching all the way down to the floor with two strands sticking out from the top and sloping backward, with an orange ribbon keeping it in place. while her height is 168 cm. Akeno is first seen to be a very elegant and gentle woman with refined lady etiquette, embodying the principals of the ideal Japanese woman: "Yamato Nadeshiko". However, underneath her calm, noble and dignified atmosphere, Akeno is shown to be highly sadistic in battle and doesn't show any mercy or remorse towards the enemies she slays, casually keeping up her smiling elegant persona over an enemy's death and showing an expression of pleasure and lust upon delivering them pain. Despite her sadism, Akeno is very kind, acknowledged by Rias and Issei. As a result of seeing her mother being killed in front of her eyes and her father being unable to save her, Akeno developed a hatred for Fallen Angels, including a sense of self-loathing towards her own Fallen Angel nature, While Akeno originally had no interest in dating men due to her past, she began to take an interest in Issei, thinking of him as a cute junior and that interest intensified. She has stated that Issei is the first boy she has ever felt such feelings for as she is shown to have a desire to further her relationship with him. She also loves to tease Issei and Rias, as she loves to make Rias irritated by flirting with Issei stemming from her playful sadistic. She is shown to be quite vulgar, flirting with Issei as such and doesn't care if Rias knows or saw her doing the act as she tried to have sex with him.

Asia is a beautiful young girl with long blonde hair and green eyes. She has a petite body type not too small. Her hair flows all the way down to her back, with split bangs over her forehead and a single strand sticking out from the top and sloping backward. Asia is extremely shy, innocent While initially having difficulty adjusting to her new life as a Devil, Asia has stated that she has found more important things than her faith in God, those things being her new friends, comrades as well as Issei's parents and Issei himself. He’s shown her kindness and she loves him.

Koneko is a petite girl with white hair and gold eyes. The front of her hair has two long bangs going past her shoulders and several loose bangs hanging over her forehead, while the back has a short bob cut. She also wears a black cat-shaped hair clip on both sides of her hair Koneko originally had a quiet and cold personality, rarely showing any feelings or emotions. She was also the only one in the group who did not initially get along with issei Koneko experiences a change in her personality after Issei helps her overcome her fear of using Senjutsu and now starts acting like a cat, often showing attraction towards Issei. Her love for Issei grows so much that she starts to go into her mating season

Xenovia is a beautiful young woman with chin-length, blue hair with a dyed green fringe on the right side and brown eyes She is also well-endowed with big breasts. 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. As the series progresses, it is shown that Xenovia has developed genuine romantic feelings towards Issei due to him protecting his comrades, even if he gets injured by doing so. As a result, she becomes more aggressive in seducing him, which proves that Xenovia is quite perverted as well, a fact that she is "cool"