Evelyn Livan Lucifer

Evelyn Livan Lucifer(エブリンリヴァンルシファー; Eburinrivu~anrushifā) is the offspring of Vali Lucifer and Lilith, being considered their daughter, and a supporting character, later a female protagonist, in the Highschool DxD: Яe-birth continuitity. She's the only one who can tame and be tamed by Ichijou if either of them enters a beserk state.

Along with Suophy and Rei, Evelyn is a Chimera, beings that sole existence are considered inter-dimensional and abnormal to the rules of the universe. However, unlike the other exemples, she was concieved in a normal way.

Appearance
When first introduced, Evelyn was a pale, thin and moribund with extremely long white hair and skinny body because of the seals put on her. She would not speak, but rather mumble her sentences, resulting in lack of communication and undestandment of her surroundings.

After being "tamed", Evelyn would develop a busty, tall, glamourous appareance of a mature young woman with fair skin and silver hair tied in a ponytail, a present from ichijou. After enrolling in Kuoh, she would use the typical uniform of white shirt with black linings and magenta skirt and black cape-corset.

Like her father and great-grandfather, Evelyn possesses various bat-like devil wings, in the total of four.

Personality
Being sealed for many years inside the Gremory mansion, Evelyn does not have yet a developed personality, usually mimicking the gestures and sentences of those around her. She lacks any sense of ridicule, which infurates Ichijou, but she can be also cunning and quick-lerning since "her brain is now a black-hole that needs to be filled with something".

She later adopts ichijou's straight man's personality and quirks, but she speaks in a rather monotone, unchanging tone. It is said that she lacks emotions because of her lack of touch to others, however, during her sections of narration, Evelyn is shown to be unnitentionally sarcastic and snarky. She changes her figure of speech depending with whom she's speaking to, as she speaks in Kansai dialect with Haruka, and in Kyoto dialect with Nemesis Gremory. She also talks in double quotations(""..."") and ends with "Or something like that..." or "Like Ichijou would say.", figuring her still doubts about how to adress to others.

Like her father, she's also a battle maniac, however, her motives for it are unknown, as according to her, "it's something I can't control.".

History
Somewhere in between the moments of peace during the Golden Issei era, figuring that his descendants would be as strong as him if not stronger, Vali Lucifer decided to have his own children in order to fight with them once adults. He would later marry and breed with the fake ouroboros dragon Lilith, giving birth to a girl with extreme power, daughter of the Infinite powers of Ophis mixed with the genes of the one true Lucifer's descendant.

The girl would grow up happy and filled with friends and half-siblings. Showing as much as strength as her peers, she would only be matched by her best friend and idol, Yagura Gremory. She would later be a great help during the great Apocalypse, however, for being too young to control her own power, she went mad, entering a state similar to Juggernaut Drive, and almost sinking the underworld in the process. Yagura, along with the others present DxD children used the power of the Welsh Dragon in them to then seal the girl away, putting her away in the deepest part of the underworld, that would later be home of the new Gremory center household. Centuries later, after the great apocalypse, she would be unsealed in other to become Cohen's personal bodyguard.

Powers & Abilities
Immense strength - Being the daughter of the descendant of the Original Lucifer, considered the strongest White Dragon emperor in history, and the Fake Ouroboros Dragon, considered one of the strongest existence in the universe, Evelyn is a Chimera, beings whose sole raw power can bend reality so that the universe can take their existence. She has an amount of power equal to the previous satans, and can shown that she can be strong as the current ones.

Immense Speed - After copying Aria's speed, Evelyn shown to be able to run as fast as light in short periods of time. However, due to her weaken state, she can overdo it or else her body might break, needing some minutes of rest before she can do it again. Wit - Being a "black-hole ready to devour anything", Evelyn can learn anything and everything in a short spam of few others just by observing or reading about it. Despite not knowing emotions, she can perform almost impossible feats by just looking and them once or twice.

Taming - One of Evelyn's original abilities, since she's the descedant of the White Dragon and therefore possesses some spiritual link with him, she's capable of taming a berserk Welsh Red Dragon, in her case, Ichijou Tsukino. However, it was later confirmed that is not just her link to Albion, but also to Vali, what can turn Ichijou back to normal. Likewise, due for having the Spirit of Yagura and Ddraig sealed inside of the Boosted Gear, Ichijou can also "tame" Evelyn whenever she's out of control.

The End
The End(影の光景[チエンド]; Ji Endo) also know as Shadow Sight, is the ability that allows Evelyn to completely understand a certain ability and improved it to make it her own. This goes from simply speech to complicated techniques such as fighting styles and magic runes. This not only make her almost unstoppable, but also mind-breaking and deadly by the eyes of old-praticcioners. However, she can't analyze, and therefore copy and improve, abilities that are singular to that person in question, like Sacred Gear-users or other chimeras.

Vanishing Drive
Vanishing Drive(白龍皇の影[バニシングドライブ]; Banishingudoraibu) also known as White Dragon Emperor's Shadow, is Evelyn's response to ichijou's own Crimson Queen Gear Drive. By copying such ability with her The End, Evelyn can use her dragonification abilities to change the appearance and physical prowess of her own dragon scales and abilities in order to fit better in battles. Similar to Ichijou, she can also change those settings in a middle of a battle to further improve her combat abilities as well as better fit against a certain situation that requires multiple performances. Dragonification - Being daughter of the Fake Ouroboros Dragon and the Vanishing Dragon Vali, Evelyn can turn parts of her body as hard as of a dragons, complete with scales and hard skin.
 * Vanishing Callisto Dark Matter(バニシングカリストダークマター; banishinguKarisutodākumatā) - Evelyn increases the mass of her own scales in order to gain even more strength in her punches and attacks. At the cost of her speed, she shown extremely powerful in this state, capable of destroying parts of buildings and soles with it.
 * Vanishing Ganymede Light(バニシングガニメデライト; Banishinguganimederaito) - In this form, Evelyn is able to create powerful spells and illusions, as well as fuse them both to create real explosive suicide afterimages.
 * Vanishing Europa Lazer(バニシングヨーロッパレーザー; Banishinguyōropparēzā) - Evelyn's become thinner and her scales becomes thin and sharp, similar to blades. In this form, she's able to travel long distances in short periods of time(almost at lightspeeds) without receiving any damage or drawback from it. Being the weakest and most fragile of the abilities, she can cut almost anything with her scale blades and super speed.
 * Vanishing Io Supernova(バニシングイオスーパーノヴァ; banishinguIosūpānovu~a) - Evelyn's final form. She didn't use it yet, but it says that it's power is similar to Empireo Juggernaut Overdrive.

Flight - being descendant of the original Lucifer, Evelyn can fly, glide and control her landing with her four wings.

Trivia

 * Evelyn's images are based on the character Shirley from the Aka Akatoretachi no Monogatari series.
 * Evelyn's name is an Amalgamation between "Eve", the second human and Adam's wife in the Christian Lore, and "Lilin", which are evil offsprings of Lilith. Also, Evelyn can be an anagram for both Vali's and Rizevim's name combined.
 * All of her forms in Vanishing Drive are named after one of the moons of Jupiter plus a cosmic event or matter.
 * Her ability, The End, is based in an ability(abnormality) of the same name in the Medaka Box series.
 * Like Ichijou and Rei, Evelyn is represented by a number, in her case, the number four(being the fourth generation of the Original Lucifer's lineage, having four wings and syllables in her name, four forms in Vanishing Drive and being the fourth girl Ichijou kissed.).
 * Her ribbon is actually Akeno Himejima's ribbon which Ichijou passes to her as a gift.