(Credit to @ZebastianPR)

Name: Samantha Starlight Heartfilia

Titles: The Sword Mistress, Ancient Ruler Ancestor, The Berserker Queen, Deflecting Goddess and the true Queen Slayer.

Age: 19

Height: 6'8

Gender: female

Race: Dhampir

Looks:

Family: Father (Unknown), Maria Starlight Heartfilia (Mother), Jake Starlight Heartfilia (Brother), and Lucy Heartfilia (Cousin).

Love interest: Y/N.

Personality:(Friends and allies) Very Kind, a little serious, Fearless, super resilient, very responsible, respectful, brutally honest, calm and collective, Honorable, caring, embarrassed sometimes, stubborn, a bit flirtatious, super ambitious and very adventurous. (enemies) Very serious, stoic, cold, rarely gets cocky, merciless if pushed to far, very ruthless, brutal, determined and emotionless.

Likes: Sparring, her swords, training her friends, taking down strong opponents, training, getting stronger, hugs (especially Y/N), destroying overconfident people, beer, creating new swords, meat, getting stronger, fighting, the armor that her brother makes, dancing and family.

Dislikes: Issei (for obvious reasons), perverts,(despises them greatly....for one exception of course), annoying people, bad meat (especially if it's horribly cooked), someone trying to hurt her friends and Y/N, not understanding the situation, stupid people, losing, dishonorable warriors, her swords getting taken or damaged, seeing Y/N down, not getting stronger, training getting ruined, abuse and waisting her time.

Skills and abilities:

. Able to wield 3 swords at the same time.

. Master in wielding many different blades.

. Inhumane strength.

. High stamina.

. Able to hypnotize her opponent's by looking at them in the eyes.

. Huge amounts of endurance.

. Inhumane Flexibility.

. High senses.

. Able to float and fly on small distances.

. Master in smithing weapon's of any kind even with little materials.

. Master in hand to hand combat.

. Great leadership.

. Incredible speed.

. She can rarely get drunk.

. High Resistants against fire magic.

. Able to transform from a bat to werewolf.

. Master in manipulating water.

Personal Weapons:

The weapon named Harbinger is a long sword that is almost the user's size and although it doesn't show much at first it's appearance says otherwise. The blade was almost bone like appearance and the handle having the appearance of teeth near the bottom of the handle. The blade can easily cut through many things but the handle can change it's appearance when the blood from either her own or by someone enters the teeth like handle the teeth open and roars before separating making it look like they were wing's and the blade changes a lot more gaining even more appearance of bones the center blades actually gaining a bit of flesh and teeth. 

Both the durability, sharpness and strength are increased but not just that the blade can actually open up and reveal to be a mouth with a giant tongue that can be used to either smack from long distances or pulls them towards the jaws in which it can close them up and if they don't get out of it it will do either major damage or cut them completely in half. 

The sword can buff the user if it consumed blood in which it increases her strength and speed a whole lot more but the user slowly gaines a sadistic personality and even more obsessed in battle to the point she becomes bloodlust should she continue using the blade. If she let's go of the blade or someone special to her calms her down she will regain her senses and the blade goes back to it's second form.

This Short blades called Nights Edge located and holster around the user's waist. Though the appearance having cracks on the blades they are actually in fact a lot durable then what it seems to be. 

This weapon though very short it gives the user huge amounts of mobility and speed, the look like crows that are at the handle aren't for decoration either cause it allows the user to teleport by throwing one of the blades to the specific place and can either teleport when hitting the target or when it still mid air/launched. 

This gives the user the ability to flank and even go some places that seems impossible, to know how it activated she precess a little yet barely noticeable button on top of the head in which a purple glow appears in the eyes. The power of the blades can only be used by the people worthy of the blades alone.

A longsword that's not only twice the user's size but also the strongest other than Harbinger and the name of it was Dawnbreaker. Not much is known on how it was created nor on how the user obtained it in the first place but the power emanating from it is tremendous and only someone worthy enough can wield the weapon in the first place otherwise no one will be able to lift it up. 

The sword is nearly indestructible and despite the size of the blade it is very light to the one able to use it, the blade allows the user to wield and even control fire base elements and giving them full immunity against any and all flame base attacks. The user can also launch arc base attacks in which are slow but is very wide that is almost impossible to dodge and leaves a huge trail of lava underneath it. 

Finally should the user has enough determination and it's heart isn't tainted it will unleash it's true potential, the sword will glow and flames slowly up in flames appearing on the blades, small trails of Lava goes down the blade in which the ground melts because of the heat. 

In this state the user strength is increased tremendously including their endurance and gain certain abilities though the form of the blade can only last around 30 minutes at most as if pushed to far it will go in overheat mode in which anything in it's facility melts minus the user and if if the user doesn't stop it before it's to late the blade will slowly melt until there is nothing left. Though luckily it can rebuild itself when it comes to this type of state alone but it can take around months or even years depending on how much it truly melt down.

Magic: Water God Slayer Magic

Spells:

1- Water God Watery Grave: The spell allows her to drag anybody who's on the water into the bottom and even trapping the individuals underneath the water with a giant shape hand around the body. When this happens they will have difficulty to move and will lose consciousness or even die if she chooses to do it. The spell can only work if there is water nearby and the individual or individuals are in the water.

2-Water God Rainy day: The spell allows her to make and area around her for 45 meters with dark clouds surrounding her. It gives her the ability to move a lot more faster in her movement speed as well has her agility and as a bonus as well physical attacks will go through her. The effects only work for her and can only gain those effects if she's underneath the spell especially the last one.

3-Water God Tranquility: This spell gives her the ability to heal her and a group of individuals by surrounding her hand's in a watery Orbs. The Orbs can heal any individual injuries in and instant and even heal severely injured that looks nearly impossible to heal and even cure certain diseases and sickness. The spell also if she uses it on herself she can actually recover some of her fatigue to full energy though it only works on her alone. Finally if a limb is detached or even broken it will heal it completely and make it look like it never happened but it as to be fully in tact without losing it or being in a worst state.

4- Water God Sea God Shield: It forms a giant shield in-front of her in which it levitates in the air. The shield can block almost any type of attack that it receives even if it was lightning base attack. But it does have certain limits on how much damage the shield can absorb before it either explodes or it disappears completely and the shield cannot move anywhere else and stay stationary.

5- Water God Tsunami: The spell only works if there is enough water in the area. The spell allows her to create a huge Tsunami that can decimate anything in it's way, she can also ride and control the giant tide on where it can go and do damage. Though the spell is very destructive it can only be casted with sufficient water and no matter wether it's friend or foe it will consume them so she uses this if a situation is met.

6- Water God Dragon's Cradle: It allows her to create a sphere of water that swirls around her and any group near her. This is used as transportation when underwater in order for not only her but also the people around them to breathe fresh air while also witnessing the scenery from the outside. This spell is a lot more used when going underwater so there's barely any use for it on land.

7- Water God Sea Dragon' Roar: A powerful spell that starts by extending her left arm in which generates a huge amounts of water before launching it on high speeds then the tip of the spell starts forming an actual sea dragon with sharp teeth, eyes and even fins. The spell as huge destructive power in which it is able to take out many people wether using defensive spells and even if the attack missed she can redirect the attack mid-flight of the attack. Though it is quite powerful she can only cast this spell twice before tapping out because of the huge amounts of magic needed to cast it in the first place.

8- Water God Valkyrie: One of her strongest and most powerful spells that Grant's her a full suit of armor made of water in which takes the appearance of an actual Valkyrie having her clothing turned also because of it with some like breastplates, vambraces, spaulders, chausses and even a tiara at the top of her head. The spell also grants her wing like ornaments that cover around her ears with the same around her lower regions. Finally they gained also a giant lance made out of spiral water that is holding on her right hand. 

This gives her mastery in using and manipulating the water itself with even increasing her strength of attacks and as well increasing both her speed and reflexes. It also allows her to glide on the air with a stream of water following her every way making her following attacks wether being physical or magical a whole lot stronger and she could even use them as platforms if she wished to. 

Though powerful it does have a cost that if she stops this spell she won't be able to use it again depending on how magic she has left and it also locks her in using different spells since it uses up most of her power until she has fully recovered it back, so she uses it as a complete last resort or if she is backed on to a corner.

9- Water God Fury: Unleashes a torrent of high-pressure water that can cut through solid rock. Deals severe water damage and can pierce through most defenses.

10- Water God Bellow: Releases a massive stream of water from the caster's mouth. Wide-area damage with high knockback, often used to clear multiple enemies.

11- Water God's Healing Rain: Summons a gentle rain that heals allies within its range. Restores health over time and cures minor ailments.

12- Water God Whip: Creates a long, flexible whip of water. Can be used to lash out at enemies, bind them, or disarm them.

13- Water God Leviathan: Summons a massive, serpentine water construct to attack enemies. Causes devastating damage and can crush or sweep away multiple foes.

14- Water God Maelstrom: Creates a powerful vortex of water that drags enemies into its center. Traps and damages enemies continuously while restricting their movement.

15- Water God Tidal Wave: Conjures a giant wave that crashes down upon the battlefield. Deals extensive area-of-effect damage and can drown or wash away enemies.

16- Water God Abyss: Opens a portal to the deep ocean, flooding the area with crushing water pressure. Enemies caught in the area are subjected to immense pressure, causing severe damage and disorientation.

17- Water God Veil: Envelops the caster in a shroud of mist and water, rendering them nearly invisible. Greatly increases evasion and stealth capabilities.

Secret Arts: 

1- Water God Eternal Deluge: An ultimate technique that unleashes an unending torrent of divine water. Continuous, massive damage over a large area, transforming the battlefield into a flooded wasteland.

2- Water God Divine Tsunami: Summons an enormous tsunami imbued with divine power. Unstoppable force that sweeps away everything in its path, dealing catastrophic damage and leaving a trail of destruction.

3- Water God Ocean Wrath: Calls forth the wrath of the ocean itself, creating a storm of water and lightning. Combination of water and lightning damage, causing widespread havoc and paralyzing enemies caught in the storm.

4- Water God Purification: A sacred technique that purifies everything it touches, including curses and dark magic. Cleanses the battlefield of all negative effects, heals allies, and damages enemies with unholy or dark affinities.

5- Water God Final Judgement: A forbidden spell that calls upon the full wrath of the Water God. Creates a colossal tidal wave infused with divine energy that obliterates everything in its path. 

And done. I hope you guys like @ZebastianPR work, caused I did and he did an amazing start. All he and I need to do is figure out where and when she will make her first appearance. 

Let me know what you guys think at the comments below, peace out and enjoy!