Ravel Phenex

Ravel Phenex is the younger sister of Riser Phenex, the youngest sibling of the Phenex Clan, and a former member of her brother's peerage. Like her older brother, she has inherited the powers of the Phoenix, and possesses the power of fire, wind, and immortality.

Appearance
Ravel is a young girl with long blonde hair and dark blue eyes. Her hair is tied in twin ponytails with large, drill-like curls, and blue ribbons keeping them in place. The front of her hair has several bangs hanging over her forehead, with a V-shaped fringe hanging over the bridge of her nose.

Her initial outfit consisted of a light purple dress with dark purple accents and a blue bow at the front. At the back, three feather-like extensions mimicking a bird's tail protrude from the dress, which, when combined with her wings of fire, give her a bird-like appearance. Upon transferring to Kuoh Academy, she wears the Kuoh Academy girls' uniform, with the addition of a black sweater over her dress shirt.

In the anime, Ravel wears a long, pink dress with white frills and a magenta bow in the front. At her brother's engagement party, she wears a purple dress with matching gloves and black boots, and holds a pink folding fan.

Personality
Ravel is a well-mannered, modest, elegant, and polite young girl, but shown to be initially harsh towards those whom she dislikes. She is also stubborn and childish at times, having a habit of wanting other people's belongings. She's very loyal to her older brother, as she is seen diligently obeying his authority. She strongly believes that her brother is so powerful, no one could ever possibly defeat him. However, after witnessing his crushing defeat at the hands of Issei, she becomes attracted to him, and later falls in love with him as the series progresses, albeit in tsundere tendencies.

In truth, she does not really mind being one of Issei's "servants", or otherwise his "concubines", just as long as she can continue to be by his side. It is highly possible that she will trade herself to become one of Issei's Bishops when he gains peerage, for she only wishes to be of use to him. Later on, she seems to have grown very proud for being Issei's manager and therefore, continues to study diligently so as to serve as his support in the future.

Despite her young age, she's very intelligent and perceptive, being able to understand the atmosphere of any situation as well as surmise Issei's thoughts just by simply looking at him.

History
Ravel is the youngest child among the four Phenex siblings and the only daughter of the Phenex Family. She became Riser's Bishop at some point before the series.

The Red Dragon Emperor's Awakening
Ravel makes her first appearance in Volume 2 during Riser's visit to the Occult Research Club in the latter's attempt to make Rias reconsider their arranged marriage. She later reappears in her brother's Rating Game against Rias as one of the remaining members that were not eliminated. However, she was forced to retreat after Issei activates the Boosted Gear Gift in a combination attack with Yuuto Kiba's Sword Birth. She is later seen attending her brother's engagement party, witnessing Issei's triumph over her brother.

Birth of the Breast Dragon Emperor
Ravel appears in Volume 5 at the party during the Young Devils Gathering (accompanied by Isabela), where she explains to Issei about her brother's then-current condition and that she is now a "free" Bishop after her mother traded her from her brother's peerage. It is at this point that she starts calling Issei with honorifics, "Issei-sama", following the latter's request to be called by his first name.

In Volume 6, Ravel briefly appears in the television station the Gremory Team were at, delivering Issei her handmade cake and running out, due to embarrassment after Issei complimented her on her cooking much to the other girls' displeasure.

The Heroic Oppai Dragon
In Volume 7, Ravel helps Issei and Rias in another one of their Oppai Dragon campaigns.

At the end of Volume 9, Azazel mentions that Ravel is transferring to Kuoh Academy as a first-year student.

Ravel arrived in Volume 10 and became a first-year student alongside Gasper and Koneko (the latter in which she has a love/hate relationship), and later moves into the Hyoudou Residence with Issei and co. so that she could spend more time with him.

At the beginning of Volume 11, she becomes Issei's manager in the Underworld under Sirzechs Lucifer's request due to the latter's show gaining popularity among the children. Later on in the end, she starts crying after realizing Issei's demise upon seeing his Pawn Evil Pieces.

In Volume 12, she was encouraged by her two brothers to cheer up. Later on, she, along with the rest of the Occult Club, were elated upon Issei's reappearance, and later congratulated him on passing his Middle-Class Promotion and says that she wants to go on a date with him.

The Legend of Oppai Dragon and his Lively Companions
In Volume 14, she starts off fighting with Koneko over the right to sit on Issei's lap. Later, while everyone was consulting with Mephisto Pheles about making pacts with Magicians, he warns Ravel about the Stray Magicians and their dealings with the Khaos Brigade on fake Phoenix Tears, and that she might be targeted. She aids Issei in choosing a Magician and while doing so, gave her opinion on Rias Gremory's Peerage and how they were unique among the Devils. She is later kidnapped alongside Koneko and Gasper during an attack on Kuoh Academy during school hours. She, along with her fellow first years, are rescued by the combined forces of the Gremory and Sitri groups. After reuniting with Issei, she proclaims that she never lost faith in him and believed that he would rescue them.

In Volume 15, Ravel continues to assists Issei in finding a magician for him to make a pact with, where as Kuroka suggested that Le Fay might be suitable for it, however Ravel turned it down due to her former affiliation with the Khaos Brigade. Regardless, Ravel does question Le Fay and discovered that she has actually surpassed her criteria to assume the role.

In Volume 16, Ravel bid farewell to the Occult Research Club members, Bennia, and Loup Garou who are going to Romania to aid Rias and Yuuto. She reminded Issei to mind his appearance, just like a manager would. After the meeting for the formation of D×D ended, Ravel accepted Issei's request to make Le Fay his contracted magician.

Powers & Abilities
Immortality: While not shown yet, as a member of the Phenex Clan, it is likely Ravel shares her family's signature regeneration abilities, being able to regenerate lost limbs and recover from wounds instantaneously.

Pyrokinesis: Coming from a family that represents the Phoenix, Ravel is capable of using fire-based attacks. In the manga side-story, she is shown to be capable of blowing half of her brother Riser's head away with a single attack.

Flight: Being a Devil, Ravel can fly using her fiery wings.

Enhanced Magical Power: Being a Bishop, it can be assumed Ravel has an impressive amount of magical powers.

Expert Tactician: Ravel has also shown herself to be somewhat of a strategist, taking note of various fighters and coming up with a new way for Issei to use Illegal Move Trident's Bishop form.

Trivia

 * Ravel's body measurements are B85-W59-H84 cm. (B33-W23-H33 in.) and her height is 153 cm. (5 feet), according to the visual book with her data.
 * According to Riser, the reason why he turned Ravel into one of his servants is because he wanted a "little sister-type" girl in his harem (he dissociates himself being a person with a sister complex). This is further expanded upon in one of the manga's side chapters, where he also claimed he wanted a tsundere type.
 * While her breast size is stated to be slightly larger than Asia's, visually her breasts have gone from being just below Xenovia's to being as petite as Koneko's in one illustration (later confirmed to be a mistake of the illustrator, Miyama-Zero).