Name: Y/n L/n-Gremory

Age: Looks between 18-20, is older then Rias by a lot but younger then Sirzechs.

Race: Devil

Devil Power Level: Low Ultimate Class

Looks: However you want. However, he does have Zoro's scar on his left eye.

Wears:

Personality: A combination of Luffy, Zoro, and Sanji

Likes: A combination of Luffy, Zoro, and Sanji

Dislikes: A combination of Luffy, Zoro, and Sanji

Equipment:

Wado Ichimonji (Middle): One of the 21 Great Grade Meito.

Sandai Kitetsu(Right): A Grade Meito, said to be "cursed" and will bring great misfortune upon its owner.

Enma(Left): One of the 21 Great Grade Meito. Used by the Legend Kozuki Oden.

A Golden Lighter: A lighter given to Y/n when he was 10 years old, he still has no idea who gave it to him, but he feels as if it's an heirloom.

General Skills:

Haki: A mysterious power that allows Y/n to use his spiritual energy in multiple ways.

Observation Haki: Gives Y/n a sixth sense of the world around them, allowing him to sense the presence, strength, and emotions of other people. It also grants limited precognitive abilities, allowing him to sense his opponents' intentions and predict their actions and attacks before they happen

Armament Haki: Allows Y/n to use his own spiritual energy as armor to defend against attacks, as well as make his own attacks more potent. He can apply the armament to a section of his body, over his entire body, and even imbue it onto his weapons.

Conqueror's Haki: Which grants Y/n the ability to unleash his own willpower to overpower the will of others. This results in victims being mentally overwhelmed by Y/n, with particularly weak-willed foes instantly losing consciousness. Haoshoku is a rare form of Haki that only one in several million people are born with the ability to use. Y/n can also infuse this haki into weapons/attacks to increase their power even more.

Specific Skills:

Gomu Gomu no Mi: Y/n's body has the properties of rubber, he can stretch it at incredible lengths and has developed many techniques around it.

Gear Second: This technique involves Y/n speeding up the blood flow in all or selected body parts, in order to provide them with more oxygen and nutrients. This makes him much faster and more powerful. The technique uses even more oxygen and energy, using up more food and causing Y/n to pant heavily if used too much.

Gear Third: This allows Y/n to inflate any part of his body to gigantic levels of size, increasing the attack power greatly. Can be combined with Gear Second, although it is very dangerous and will leave Y/n exhausted and very tiny if used too much.

Gear Fourth: Y/n coats his arm in Armament Haki before biting into his forearm. Similar to how he activates Gear Third, he blows an incredible amount of air into his body, but this time he inflates his muscular structure before distributing the air throughout his body, with emphasis on his upper half.

Gear Fourth Forms:

Boundman: Y/n's proportions become warped and his body becomes much larger in size, with his arms, upper torso, and legs coated in Armament Haki. As a side-effect, he is incapable of standing still on the ground, and instead constantly bounds on the spot.

Tankman: In this form, Y/n resembles a sumo wrestler with exaggerated proportions: while his arms and legs are slightly increased in size with muscle, his Armament Haki-coated torso becomes far larger and completely round, though still muscular near the top. The flame-shaped Haki also covers the bottom of his torso in addition to his shoulders and arms.

Snakeman: Unlike his other two Gear Fourth forms, Y/n does not significantly expand, with his forearms, legs, and upper torso being only slightly enlarged and the rest of his body retaining its normal proportions. The spread of Haki is slightly more limited, as it does not appear to extend onto Y/n's shoulders and upper body.

Sword Styles:

Zero Sword Style: This is an unorthodox form of his fighting style that uses no swords.

One Sword Style: These are the attacks he uses with one sword. As Y/n is left-handed, his One Sword Style techniques have nearly always been executed with his left hand. He usually uses for them, but he seems to be proficient in using each of his three swords for his one-sword techniques. He mainly fights with one sword when not fighting seriously or when he is using a specialized cutting technique.

Two Sword Style: These are the attacks that use two swords. These are some of Y/n's most common attacks when he has to take a fight a little seriously and doesn't feel like going at full power just yet.

Three Sword Style: Y/n's main sword fighting style for when he goes all out. He will hold a sword in each of his hands and one in his mouth. This is the form he has trained with the most and has perfected the most. He saves this style for the strongest of the opponents or multiple opponents at once.

Nine Sword Style: This style is an extension of Y/n's spirit and, as the name suggests, involves nine swords. Through sheer will, Y/n creates an illusion of two more heads and four more arms appearing on him, which wield copies of his swords for a total of nine blades. At the same time, a three-headed, six-armed silhouette appears behind Zoro, making him resemble a "demon god" (the mythological ). Thus, Y/n's power grows threefold, as he can use his nine swords to slice an opponent thrice more than usual, and Y/n tends to do so by rushing past his foe at high speeds.

Kicking Skills: 

Black Leg Style: This style has a complete emphasis on kicks, repurposing the use of hands into acrobatics such as handstands to augment the force and range of kicks and to prevent the hands from being damaged during a battle. Thus, it boasts a wide and impressive array of kicking techniques coupled with superior acrobatic skills, making it an extremely versatile martial art, able to effectively weave continuous and powerful attacks upon adversaries and overpowered numerous enemies at once with incredible efficiency.

Diable Jambe: This is a technique where Y/n heats up his leg, adding extreme heat to the impact of his kicks. While doing so, Y/n has the ability to burn his opponents or light them on fire due to the high temperature. Y/n can utilize this technique with either his left or right leg, as well as both at the same time.

Ifrit Jambe: By imbuing his devil nature with his Armament Haki, Y/n's legs became capable of enduring much hotter flames than before, turning blue while producing blazes resembling lightning. By using the vastly increased speed and weight behind his strikes in conjunction with incredibly intense flames, Ifrit Jambe makes Y/n's kicking techniques incomparable to before.

Family:

Zeoticus Gremory (Father)

M/n L/n (Mother)

Venelana Gremory (Step-Mother, but sees as his other mother)

Sirzechs Gremory (Elder Half-Brother)

Rias Gremory (Younger Half-Sister)

Millicus Gremory (Nephew)

Grayfia Lucifuge (Sister-In-Law)

Quotes:

"I'M GONNA BE KING OF THE DEVIL PIRATES!"

"I want to be the Underworld's Greatest Swordsman!"

"I will be the Underworld's Greatest Chef and Harem King!"

Harem:

Sona Sitri

Ravel Phenex

Akeno Himejima

Koneko Toujou

Kuroka Toujou

Serafall Leviathan

Xenovia Quarta

Ophis

Nami

Nico Robin

Boa Hancock