Titles: The Red Dragon Emperor, Oppai Dragon, the Crimson King, The Ashen One, Lord of Cinder, The Scorched Emperor.

Personality: Issei is a kind caring young man who'll help anyone in need. He has a strong sense of honour, chivalry and pride, when he's alone with his lovers, tends to show a large amount of perversion. Issei is a great leader having been taught by likes of Tannin and Sirzechs, however people tend to view him more so as a father or older brother figure due to how he carries himself in the presence of others. In addition, Issei is a well taught tactician having managed to overcome great odds with nothing but his wit and his will. He's a very charismatic capable swaying the most stubborn of people. However, while he does have the patience of a saint and a decent control over his emotions, thanks to his teachers, should you some how manage to anger him than be prepared to meet god as there is nothing in this world that would stop him. He's also an artist and a great craftsman.

Looks:

Outfits:

Weapons:

The Rebellion -

Forged from the corrupted remains of the holy sword Ascelon. The blade was named to reflect it's newfound nature as the embodiment of retaliation. Perfect for the broken world Issei finds himself in.

Infernal Faith-

The blade has many names with it's most common ones being the Devil Sword Issei and the Brimstone Blade. This blade came to be when Issei had absorbed the Rebellion. The Infernal Faith is a formidable blade, its sleek design adorned with mystical markings. As darkness intertwines with its razor-sharp edge, the sword possesses an otherworldly power. With the ability to transform and unleash devastating attacks, it becomes a symbol of both elegance and chaos in the hands of its wielder.

Ebony and Ivory -

Wanting to create a new set of ranged weapons, Issei studied his guns and drew up a set of schematics for a twin set of guns. Dubbed Ebony and Ivory, the guns have the unique ability to never run out of ammo and in a similar fashion to Scorch and Cinder they can be charged with magical energy for increased damage.

Powers and abilities:

Domain Expansion: Divine Wrath Of Kings - By calling forth his Eikonic powers, Issei is able to create a barrier resembling a battlefield littered with broken weapons.

All Speak - The direct evolution of Issei's Pailingual, All Speak allows Issei to talk to anything. Fron horses to babies, Issei can effectively speak and understand any language making it real useful for translating ancient languages.

Kazama Martial Arts Style - A fighting system characterized by throwing techniques and joint manipulations to effectively subdue or injure an attacker, and defensive techniques used either to blend or to neutralize an attack's effectiveness and to use the force of the attacker's movement against them.

Dress Break - Original used for his perverse tendancies, when the apocalypse rolled around he recycled the ability to use it in a more effective state. The power allows him to destroy armour and clothing but it has a more deadly effect on flesh as it strips its target down to the bone.

Royal Guard - Having trained with the powers of destruction under Le Fay's tutalage, Issei was able to create the ultimate defense. Instead of destroying, Issei instead allows the power to absorbed any and all physically attacks sent his way.

Full Counter - An offshoot of Issei's Royal Guard Ability, Instead of absorbing any and all attacks and realising it back in one well timed attack, Full Counter reflects any magical attack back at to sender with double the power.

Aeromancy - Having absorbed Garuda's powers, Issei is now capable of manipulating the air itself.

Photomancy - Having reawakened the true form Albion's power as Light Aether that had been separated from Bahamut, Issei is capable of manipulating light magic with relative ease.

Pyromancy - Due to being the Warden of Inferno, Issei capable of manipulating fire with great ease.

Ashen Light - Issei can create a hovering ball of fire that illuminates his surroundings. Useful for when he has to enter dark areas without a torch.

Judgment - When SDT'd, Issei can create a demonic sigil that temporarily slows down time allowing him to perform an obscene amount of slashes that end in a fiery explosion.

Deliverance - While SDT'd, Issei pours a large amount his infernal flames into his fist and punches the ground creating a large explosion.

The Luce - While SDT'd, Issei focuses his energy into his outstretched wings and razes the earth with a laser barrage.

The Ombra - Pooling his demonic energy into his hands while SDT'd allows Issei to throw pure destructive balls of energy at his opponents.

Vortex - While SDT'd, Issei can condense his magical energy to create a miniature black hole that sucks in his enemies before exploding.

Brimstone - By calling forth his infernal flames, Issei can create a massive explosion of fire. Ultimately, when he performs the move, Issei generates a dome of fire around himself that acts as a temporary shield that if hit causes it to explode prematurely. Truly, the best means of defense is a great offense. Admittedly, the move is only at its strongest when Issei has Primed into Ifrit.

Phoenix Shift - Allows Issei to teleport to his enemies in a swath of flames.

Lightspeed - An enhanced version of Phoenix Shift, Issei gains this power when he awakens Ifrits full power and transforms into Ifrit Risen. This moves allows Issei to move at speeds so fast it appears as if he's teleported in a burst of puff of flames.

Flames of Rebirth - Calling forth the Infernal flames within himself allows Issei to once again call forth a pair of fiery wings that can summon a massive pillar of fire that burns all enemies caught within its flames, while also partially restoring any wounds he has.

Scarlet Cyclone - Spinning quickly, Issei summons a pair of fiery wind to create a ring of fire that burns all enemies in range.

Heatwave - Imbuing his blade with fire, allows Issei to summon a projectile-dispelling wall of liquid flame before launching several deadly shockwaves. Wave force is amplified upon dispelling magic.

Rising Flame - Issei summons a fiery wing to launch his enemies into the air.

Wildfire - A special ability that can only be used when Issei has Primed. This ability essential acts as a speed boost

Hellport - By drawing in the flames around him, Issei can summon a whirlwind of fire that transport him to where ever he is needed albeit as long as he has visited the place before.

Infernal Armament - Due to his ever growing control over fire, Issei is capable of shaping his flames into any type of weapon he can think of be it a sword, axe or spear.

Spitflare - When Primed, Issei is capable of shooting a continues beam of fire from his mouth dealing tremendous amounts of damage to those caught in its blast.

Damnation in Hellfire - When Primed, Issei can call forth a huge fireball capable of creating large amounts of destruction.

Ignition - Issei launches himself into a forward charge while covering himself in flames, helping him deal continuous damage and push small enemies along.

Will-o'-the-Wykes - Allows Issei to summon a storm of fireballs that circle about him, damaging nearby targets, while also absorbing damage.

Deadly Embrace - Having absorbed the powers of Garuda, Issei can now send a grappling claw out to grab an enemy and pull it towards himself. Although grappling heavier enemies will launch him into the air.

Gouge - Issei summons twin claws that relentlessly tear at a target.

Wicked Wheel - Issei will manifest Garuda's claw and rise up into the air, damaging all enemies in his vicinity and lifting them alongside with him if they are small enough.

Aerial Blast - Issei, using Garuda's powers, summons a tornado that slowly hunts down nearby enemies and, upon ensnaring them, inflicts multiple hits.

Flare Breath- Issei breathes forth a plume of light-aspected flame that deals continuous damage.

Wings of Light - Issei calls forth Bahamut's wings and begins charging up his light magic before unleashing a volley of lasers down upon his enemies.

Impulse - Issei Summon multiple spheres of light that, upon striking an enemy, deals continuous damage and binds them to the spot.

Satellite - Issei summons multiple light-aspected familiars that attack any enemy on which he uses his magic.

Gigaflare - Issei fires a massive beam of overcharged light that burns any enemy it hits.

Vehicles:
Cavalier -

Issei creates this vehicle when he imbues an ordinary bike with his infernal flames. Not only can it act as a means for transport but it also doubles as a weapon. On the plus side at least he doesn't have to worry about fuel.

Hell Charger -

Originally a 1969 Dodge Charger RT once infused with Issei's Infernal flames, the car became something more. It's capable of regenerating from whatever damage has occured to it as well as being able to drive by itself. It's easily the fastest vehicle Issei will ever own. Like the Cavalier, the Hell Charger doesn't need to refuel either but unlike the Cavalier it can't be used in combat as a weapon but it does make for a great shield though. Oddly enough, the boot of the car connects to the same storage place that Issei can access to store his stuff, apparently it connects to a small section in the Dimensional Gap that not even Ophis knows about.

Forms:

Limit Break -

Issei gains this power when he learns to accept his inner darkness. With this form Issei gains a new found sense of control over his infernal powers. This form grants a boost to all his powers and grants a small healing factor. The form allows him to temporarily tap into his Eikonic Devil Trigger without needing to transform.

Devil Trigger -

The upgraded form of Issei's Limit Break form. The new form was a fusion between his dragonic and demonic status and mixed with his infernal flames granting him an improved healing factor for his human form. Ultimately, this form replaces the Balance Breaker since the Boosted Gear was destroyed from the sudden influx of aether leading to it bleeding it's powers into Issei. It is in itself a lesser form of Issei's Eikonic Devil Trigger and is somewhat incomplete.

Primal Sin Devil Trigger -

The complete form of Issei's Devil Trigger. It rivals the power of the four great Satan's, this form combines the Powers of Destruction with the powers of Apophis and Issei's infernal flames. Coincidentally, the power up came with a new outfit for him as well. The form comes with a range of new abilities and grants Issei a stronger aptitude with magic allowing for new powers and abilities.

Digital Sin Devil Trigger -

By compressing his power, Issei is able to create a variation to his original Sin Devil Trigger. This form sacrifices overwhelming power for a compressed and more precise version on his regular power. Ultimately, speed is key to this form unlike it's variant that acts as a nigh impervious dreadnaught.

Eikonic Devil Trigger -

Issei unlocks this form after an encounter with the Phoenix. This form easily eclipses his SDT form in terms of raw power alone and can rival the other eight wardens with little challenge. What is know about this form is that it grants Issei complete mastery of Fire and only fire. However, this form still appears to lack something and almost feels as it, itself, is incomplete as well. Moreover, this form did subsequently lead Issei to unlock his Devil Trigger.

Eikonic Sin Devil Trigger -

Issei acquires this form after absorbing Trihexa's powers and fusing it with his Eikonic flames. By doing so Issei gains his strongest form yet elevating himself to the status as the new Dragon God of Destruction and Fire. This from is capable of destroying the world.

Familiars:
Blaze the Phoenix

Issei meets his familiar soon after he left the hospital. Now, the bird serves as his faithful guide as it helps him navigate the broken world he currently finds himself in.

Scorch the Liquid Flame

A being comprised completely of fire, unlike Blaze, Scorch is a being created solely from Issei's flames and can take the shape of whatever it desires.
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Right that's it for the bio for now but I will revisit it later in the story. Now Issei will gain more weapons later in the story but he'll largely rely on his swords. Ultimately, I'm choosing to keep the rest as a surprise.

I'd also like to add that I'm taking Issei's artistic skills and utilising them more often as it will help in crafting new tools and items. Azazel helped Issei work on his art skills before teaching him engineering skills leading him to learn that Issei is a great craftsman.

So there, the bios been update and has been fleshed out a bit more. In addition, I'm giving Issei a gen 1 Optimus Prime mind set with the addition of a Bayverse Prime/Kratos level rage and he won't be as bothered by killing people as long as he has a good enough reason.