Eunice

Eunice「ユーニス」 is an elite warrior of the Demon Clan, serving directly under the Demon King as the Pacifism of the Ten Commandments.

Eunice was originally a small poisonous snake that lived for 300 years bathing in miasma from the Demon Realm. Thanks to this miasma, she grew into a giant hooded snake, being able to take on a human form as well. At some point, she was chosen as the Faith of the Ten Commandments by the Demon King himself.

After Ludociel imprisoned a horde of demons as bait, the Ten Commandments Melascula, Monspeet, Derieri and Galand, along with Fraudrin, led an army of demons to the Fairy King's Forest. They were confronted by Elizabeth, who wanted to stop the fighting between the Goddess and Demon Clan. While she talked with the demons, Ludociel revealed the giant Ark holding the captured demons. Melascula noted that most of them are civilians before Ludociel killed the prisoners. Angered, the demons attacked.

The Archangels Sariel and Tarmiel destroyed most of the army with an Omega Ark but the Ten Commandments survived. While the others fought the Archangels, Melascula flew to the Light of Grace where Gowther had taken control of Nerobasta.After reporting the situation, annoyed that Gowther read her thoughts, Melascula is taken by the manipulated Nerobasta to the gate to the Celestial Realm.

Melascula corrupted the gate to the Celestial Realm, preparing it to connect to the Demon Realm instead. However, Gowther tricked her into connecting it to the Demon Realm's prison, freeing the real Gowther. Furious at being manipulated, Melascula's head is grabbed by the real Gowther and immobilized her with his magic. Melascula recriminates that he dared to leave his prison without the consent of the Demon King, leading Gowther to reveal that he has no interest in the Holy War. Later forces her to open a portal to be reunited with the doll Gowther.

Later Melascula rejoices when Zeldris arrives to go after the magician Gowther.

Along with the rest of the Demon Clan, Melascula was sealed away by the Goddess Clan after losing the Ancient War against the Four Races (Human, Fairy, Giant, and Goddess Clans).

In the anime, after being told by Hinata he was just like Naruto at that age, always eager to train with his mentor Jiraiya, Boruto became intrigued to learn more about the Sannin. He then went to Sasuke's house only to find Sarada. Together, the pair decided to search for the author's Icha Icha series, during which different adults insisted that they were too young to read his adult books. Later, when Boruto learned he was the only genin that not on the mission to hunt Urashiki due to Urashiki's vendetta against Boruto, Sasuke suggested that he work with Boruto as a two-man team while staying within the village, which Naruto agreed to. That night, the majority of the village's shinobi left the village in an attempt to corner Urashiki. Acknowledging that Naruto was too well-guarded for Urashiki to go after, Boruto deduced Urashiki was after an artefact recently found that bore the Ōtsutsuki symbol. His hunch led him and Sasuke to discovering Urashiki activating the artefact to create a portal he entered. Following him, Sasuke managed to separate Urashiki from the item before being transported away from him.

Arriving in Konoha, the pair discovered they have arrived in the past, shortly after Tsunade became Hokage. Realising Urashiki's plan was to acquire Kurama's chakra from Naruto as a child, Sasuke asked the artefact Karasuki about the enemy, which explained that due to Sasuke's interference, Urashiki would not arrive in this time period for a few days, and warned them to avoid as much interaction with the past as possible or risk severe changes to the timeline. Listening to the advice, Sasuke and Boruto disguised themselves. Soon afterwards, Boruto and Sasuke bumped into Naruto and Jiraiya. When Tsunade arrived, they claimed to be travelling performers. Tsunade had Naruto and Jiraiya guard the pair, which soon after, Jiraiya left Naruto to take care of alone. After Sasuke slipped away to keep his distance, Naruto brought Boruto to his house, during which Boruto noted the resemblance between his father's young and current-self.

Later, Boruto would continue intriguing Naruto about the modern advances of the village that he comes from. He then met the Konoha 11, amazed at how all the future parents were in childhood, including to finally meet his late-cousin Neji and embarrassed at seeing his past mother shyly interact with her crush of Naruto. Later, Naruto was assigned to clean up the hot spring as punishment for his and Jiraiya's commotion there the other day. Boruto and the other genin helped out. Through the following days, Boruto deduced the truth about past-Sasuke's absence was due to abandoning the village. He confronted his master about the event, who shamefully admitted that at the time, he was so fixated on getting his revenge, he felt he had to. The following day, Urashiki arrived and found Naruto, where Boruto and Sasuke stood prepared to fight and protect Naruto.

Urashiki acted quickly and struck Naruto with his hook, shocked to see that it failed to gain any chakra. Deciding the best course was to capture Naruto, Urashiki subdued Naruto and trap Boruto and Sasuke, along with Jiraiya, who happened along inside a stone prison. Sasuke explained to Jiraiya that he and Boruto were actually ninja from a distant village with a mission to stop Urashiki from stealing Kurama's chakra and that Urashiki had ties to Akatsuki. While seeing that they were still hiding some truth, Jiraiya decided to work with the duo, breaking them free by summoning a giant toad. Soon, Sasuke locked onto Naruto's location from detecting the tailed beast's chakra beginning to leak out. Along the way, having realised that the seal containing Kurama was stopping Urashiki from stealing the demon's chakra, Jiraiya placed powerful seals on Boruto and Sasuke to protect them as well. Upon finding Naruto, Urashiki's actions forced the boy into his Version 1 state.

Powers and Abilities
As a member of the Ten Commandments, Eunice is exceptionally powerful. Like all members of the Demon Clan, he possesses their unique power of darkness, similar to Meliodas' at Vaizel. He is capable of utilizing this dark power to passively fly on her own. His aura, combined with the aura of the other Ten Commandments is so terrifying that it made the normally calm Hendrickson sweat in fear by their presence.


 * Trick Star「 Torikku Sutā; literally meaning "Raid Star"」: This ability allows him to switch two objects with each other as well as change its direction, cut through it, and even deplete its energy by reducing it into singular elemental spirit.


 * Deadly Poison「 Deddorī Poizun; literally meaning "Snake Venom Toxicity"」: In his snake form, Eunice expels from her mouth a stream of poison and digestive juice that disintegrates her opponent. Even the vapors themselves are highly corrosive that can even temporarily halt the regeneration process of Ban's immortality.
 * Jougan: This form of eye magic is only to his right eye and allows him to percept the movements of time and space and though it sounds powerful it just allows Eunice to sense on coming attacks but other than that it also allows him to send others into different places of time and/or space in a certain amount of setting.

Commandment
Grayroad was bestowed with the Commandment of Pacifism「 Fusatsu」 by the Demon King. Anyone who kills in her presence will have their time stolen from them and rapidly age until they die.

Equipment

 * Double Daggers「ツインダガー」: It seems that Eunice carries dual daggers that contain magical properties that allows Eunice to cut through magic.
 * Throwing Knives: Eunice is fairly accurate along with the help of his Jougan allows him to throw throwing knives which he stores in his pockets/clothing and he uses as a projectile.
 * Multiple Kinds of Bombs: Eunice also seems to carry circular objects that contain multiple kinds of magic enchantments that helps in many ways some effects can include spikes, smoke, explosion, freezing, stunning, poison, etc.