Name: Rin Ferrer

Age: 18

Alias: Althea

Hair Color: Scarlet

Eye Color: Black (Glows Scarlet)

Gender: Female

Appearance: (Alongside a big bust the same size as Aine from Hybrid Heart the other sisters share the same)

Personality: She's battle Crazy, Loves to fight, and loves a challenge. Even with her fighting personality, she's really friendly to be around and loves to fight her siblings. According to Rin, they're the only people who can give her a challenging fight. However, like her brother she's a completely different person when she fights her enemies she shares the same Serious and cold-blooded persona as the rest of her siblings and won't even hesitate to kill as well. 

Guild Emblem Color: Red

Outfit: Black open jacket with a skintight bodysuit underneath, Black Skirt that goes down to her knees, Black stockings, and Black 2-inch heel boots. 

Horsemen: War

Magic: Fire Demon Slayer Magic, Black Flame Magic, Unlimited Blade Works

Fire Demon Slayer Magic Spells

1. Fire Demon Rage: The most basic spell in which the user gathers magic power in their mouth and unleashes a stream of fire that scorches anything in its path. It can easily melt through walls and steel while water dragon slayers find their water unable to extinguish it and also being evaporated slowly.

2. Fire Demon Hell's Fist: The user gathers magic power in their hand or hands and encases it in fire, punching the target and inflicting burns on their flesh.

3. Fire Demon Claw: The user gathers magic energy in their hand or hands and strikes the target with their fingertips, leaving behind burning trails while they can also project burning claws towards their enemies.

4. Fire Demon Meteor Hammer: The user gathers magic power and focuses it around their person, being encased in a blazing orb which then lunges and slams the target.

5. Fire Demon Unholy Stakes: The user gathers magic power in their hand and does a swiping motion, creating a series of floating fire stakes that are fired towards the target, piercing and setting ablaze anything in their path. Alternatively, a user can generate one that they stab on the ground, filling a certain radius with countless fire stakes that erupt from the ground similar to what Vlad the Impaler did in wars putting any man or woman on spears and leaving them up there to die.

6. Fire Demon Blazing Kick: The user gathers magic power ignites their feet with flames and proceeds to assault the opponent with a powerful fire-enhanced kick, with the flames greatly augmenting the power of said kick

7. Fire Demon Laughter: The user gathers magic power in their hand creates medium-sized orbs of fire and releases them onto their target in a flurry.

8. Fire Demon Hellhounds: The user gathers great amounts of magic power in their hand in the form of purple flames and slams the ground, with numerous flames appearing that are shaped into skull-faced dogs. Said dogs can attack one or multiple enemies and will regenerate unless completely destroyed while finally, a user can combine them into a much bigger one that sacrifices speed for power.

9.  Fire Demon Pyroclastic Fist: The more advanced version of the fist spell in which the user gathers great amounts of more magic power in their fist and punches forward, releasing a big fist of purple flames that does concussive damage upon hit and then creates an explosion.

10. Fire Demon Morning Star: The user gathers great amounts of magic power in their hands and sets them ablaze before slapping them, creating between them a big orb of fire that gradually becomes bigger once thrown and causes a destructive explosion.

11. Fire Demon Infernal Jail: The user gathers great amounts of magic power in their fingers and does an incantation "Be sentenced to burning death, oh foolish Sinner! Be swallowed by the burning cage that devours soul and flesh!" and finishes with a grabbing motion towards a specific spot, generating numerous pillars that surround the target and with a mere thought, the user can combine them into a huge pillar that traps and immensely hurts the target.  

12. Infernal Wrath: Advent of Burning Death: The user gathers huge amounts of magic power in their hands and spreads them wide, all before doing a counter-clockwise motion, releasing a huge flaming skull that chases the enemy and devours them, causing a huge explosion.

13. Infernal Wrath: Nine Gates Stream: The user slaps their hands and gathers huge amounts of magic power all while creating nine orbs. Then, the orbs spin and the user faces their hands in the opposing direction and releases a huge stream of fire that scorches anything in its path and then causes an explosion that is said to make nothing ever grow in the affected area. 

Modes:

Demon Force: Demon Force is the final stage of the Demon Slayer Magic, the embodiment of the ultimate power that Demon Slayers may possess, though the exact conditions to invoke it vary from person to person. When entering the said form, the user's body fully transforms into the element the Demon Slayer has in their possession, by saturating the insides of their body and the outsides with an overdose of Magical Barrier Particles. Such form change grants them the enhancement of their physical traits, like strength and speed, and demonic abilities they have, improving their combat capability significantly. Demon Force greatly increases the damage done by standard Demon Slayer Magic attacks and grants the user access to more advanced, powerful attacks. It also drastically enhances the user's physical prowess, making them far stronger, more resistant, and faster, and boosts their demonic power, prompting it to violently become visible, taking on the shape of a demonic visage; When used at the fullest, the generated silhouette seems to gain corporeality, likely as a result of the immense amount of demonic power employed. As the Demon Slayer's entire body turns into their element, after activating Demon Force they are virtually immune to physical harm. They can allow any attack to simply pass through them or simply absorb the attack; it is essentially a boost in the demonic properties that Demon Slayer Magic provides to the user.

Overdrive: Similar to Edens Zero By allowing the user's Ether power to flow throughout their entire body, the user can acquire a massive boost to their capabilities as well as being able to achieve feats with their magic they normally wouldn't have been able to. Along with this increase in power, the user also takes on a new appearance similar to that of the machine; having three-dimensional lines surrounding their body and covering their skin. 

Demon Force Overdrive: Combining the power of Demon Force and Overdrive the user is granted an even more powerful boost in their magic power that it even starts affecting the Ethernano around them 

Black Flame Demon Mode: Turns the user's flames as dark as the Amaterasu flames from Naruto and they're so hot that they can burn other flames and nothing can extinguish them. The only way to extinguish them is by the casters themselves. 

Blue Flame Demon Mode: Similar to Black Flame Mode only these flames are so cold they burn and they're considered to be one of the hottest flames in the underworld. 

Fire Demon Queen Mode: Similar to Fire Dragon King Mode the flames of the fire demon burn hotter than the sun they can burn and destroy anything even magic and spells. According to Rin, these flames are considered the "flames of war" and nothing can extinguish them as long as she can still fight. As long as this fire keeps burning then she keeps fighting only then once she's down are the flames of war extinguished

Unlimited Blade Works

Weapons in UBW

Excalibur and Excalibur Morgan 

Future Excalibur and Excalibur Morgan

Gae Bolg

Archer's Nameless Black Bow

Balmung:

Rule breaker

Clarent: 

Joyeuse: 

Gram: 

Tsumukari Muramasa

Agni Gandiva

Vasavi Shakti

Brahmastra

Kanshou and Bakuya Plus Overedge and Gun Forms