Chapter 10 added 01.01.2018 according to timestamp. If you haven't read it don't read this character sheet, spoilers.
A while back I said I'll post Issei's character sheet, but I was delaying it since I made his stay in Underworld and events that led to it much longer (in terms of chapters and events) then I thought I will... But I think I covered everything important, so here it is. It contains minor spoilers to the next chapter (like his new appearance) but it's nothing serious. Includes things from canon to give a better picture rather than pointing changes alone.
Name: Issei Hyoudou
Age: 17
Race: Dragon-Devil hybrid (seen as: Dragon with demonic fire by dragons; Reincarnated Devil by devils; no opinion voiced by other factions yet)
Gender: male
Titles: Red Dragon Emperor (shared with Ddraig), Dragon Prince (unofficial), Perverted Beast (Kuoh Academy)
Nicknames: Ise, Partner (Ddraig), hatchling (Tannin), my hatchling / my little prince (Tiamat)
Appearance:
a) human form
Edit: I'm an idiot (thanks for pointing that out, TheLaughingStalker and leaderdbz). I wrote "new appearance" without any specifics...
His face changed slightly, but he still resembles his old self, but with some western influence. (There wasn't Ddraig's human form and Tiamat's human appearance is not specified, but I am going with simple logic: Western Dragon means Western looks in human form)
[Loosely based on Issei's description from The God of Destruction and Regrowth by Skrewksy]
"His face lost the pudgy, baby-fat most preteens had before puberty took care of it giving it more mature and serious look. His new parents' western appearance influence it and he resembled a half-foreigner more than a full-blood Japanese, but he still looked like himself, at least he thought he was. But with red hair and blue eyes, he looked more like his older half-brother than old-Issei... It could cause problems, but he hoped that there was enough resemblance to explain it by puberty. Not the eyes though. He'll have to do something about them."
- eye color: blue
- hair color: red (similar, but not the same as Gremory Crimson, little darker. According to google I am thinking of Ruby shade of red... Give me a break, I'm a guy, I know two colors "I like it" and "I don't like it")
- height: 1m 83cm (6 feet)
- well-built muscular body but not too bulky
b) dragon form
- Western Dragon with red scales (again, Ruby shade), golden spikes and blue eyes. (smaller version of Ddraig except for his eyes)
- 5m (16.4ft) tall when standing on two legs
- tail long enough to scratch his ear, very agile
c) humanoid-dragon form
- his skin turns into scales, he loses his hair and his face turns into a snout. Tail and wings obligatory present.
d) chibi-dragon form
- a big-cat sized version of his dragon form
Relatives: "it's complicated", unnamed human parents, also considered as son of Ddraig and Tiamat
Affiliations: Kuoh Academy, Rias Gremory peerage, ORC, Underworld, Underworld Dragon Faction (unofficial)
Ranking: perverted looser (Kuoh), low-class reincarnated devil [8 pieces] (Underworld), unspecified but he's respected (Dragons), Dragon Prince (unofficial)
Equipment & Abilities
- Flight (manually, he has to wave his wings to fly, no lazy magical bat-wings for him)
- Boosted Gear (Second Liberation)
- Training clothes (enchanted by Tiamat, he can modify the force they exert on him. "They don't offer any form of protection, but they are dirt-resistant and come with such self-repair ability that Phoenix would be jealous. Only 4999$ if you order in the next 15 minutes")
- Dragon outfit (his clothes (black boots and pants, red long sleeve shirt and red leather jacket) are as durable as his scales and repair after the transformation, Kuoh Academy blazer not included)
- Dragonification (three versions: dragon, humanoid-dragon, and chibi-dragon)
- Enhanced Senses
- Devil Tong
- Dragon Language (he can understand dragon and dragon-like creature's roars, growls and squeaks, and, to a lesser extent, animals)
- Night Vision
- Dragon Sight (his reptilian eyes can see wider spectrum of light including infrared radiation - heat)
- Increased durability and high magic resistance (including Holy and Divine energy) even in human form, but better in any of his dragon forms (scales for the win!)
- Immune to fire weaker than his and almost all poisons
- (Almost) Immune to mind control (Thanks, Ddraig! If someone wants to control Issei he/she has to be strong enough to control Welsh Dragon)
- Second mind (again, thanks, Ddraig! Issei can outsource some tasks, like taking care of his armor later on, to the dragon in his left hand or ask him for a solution to some problems during the fights. Also, Ddraig can warn Issei if he senses a threat, like in Rating Game against Riser, and give him status updates on his body condition)
- Autopilot (damn, Ddraig is really useful. He can temporarily take control of Issei's body if needed)
- Aura of predator (suppressed in human and chibi-dragon form but shows when he's angry. Permanently present in dragon or humanoid-dragon form. "Prey knows when its facing predator, it will fear you. Use it.")
- "Principle of domination" (As a host of Welsh Dragon, Issei is immune to magically induced ways of intimidation i.e. auras. Doesn't work when he is scared by normal means.)
- Dragon instincts ("Your body has its own mind and remembers when it was hurt. If you face that danger again, it will warn you")
- Demonic Dragon Fire: flame version of Sword Birth
- ice flames (blueish-white) flames that eat fire
- earth flames (dark brown) solid flames (his version of barrier)
- wind flames (transparent) illusion of flames (for later, when I decide that it's time to allow Issei use his demonic energy properly)
- water flames (blue) liquid flames (kind of lava), can be molded to any shape according to his will
- dark flames (charcoal grey) his version of Holy Eraser
- normal (orange)
- thunder flames (yellow, with sparks!) "because nothing is more savage than fireball that electrocutes you after exploding"
[reserved colors: white (Holy), crimson (Blazing Inferno of Scorching Flames), pale-blue (Tiamat's Chaos flames), black (Vritra), green (healing, yeah that is not Issei's style)]
Ideas of new flames are welcomed, but I don't guarantee that even those already listed will appear.