Name: Joseph Yios (pronounced either i-ē-os/u-hi-os)
Appearance before merge: He had notably dark hair and yellow irises, in addition to skin which would turn extremely dark after he would spend a while in bright sunlight, or would become ridiculously light after being in shady locations or inside for too long. He stood at 5'9" in height. He had a weight of 145 lbs. and was in excellent condition physically. He used to wear either black, white, or red t-shirts, simple denim jeans, and gray running shoes. He had a black or blue hooded jacket for moments in cold places.
Appearance after merge: He's easily 6'3" tall and has a weight of 170-180 lbs. He has sharp, dense blades tearing through his skin from his skull on the sides of his mouth which he has a dubious utility of, like new sideways razor teeth. His hair and eye color is still the same. His skin is more pallid and armor-like; it's a slightly green yellow and entirely covered with tough scales. His eyes turn bright red while he uses attacks. He has a colossal Haxorus tail. His hands, his feet, his underside, and the tip of his tail are all black. He differs from other subjects; he can voluntarily switch between his old shape and his new form based on how much Dragon-type energy he has stored up. He can remain as a Shadow Human while he is in clear daylight, although only as long as he keeps his energy reserves low by using Dragon attacks frequently. It helps for him to not have to be in sunlight to remain in his human body, though; however much Dragon energy he has doesn't matter for him to change forms while under shade. On the other hand, if he's in his Haxorus form and has no Dragon reserves, he'll be worn out and unable to attack. His energy reserves build up really swiftly, so he needs to constantly use several moves to keep them low. He will have to take a few beatings instead of just a single injury in order to begin transforming back into a Haxorus merge. If he has high enough Dragon energy, he may become rampant in his Haxorus form, slowly grow larger, and have to painfully suppress himself from going on a terrible Outrage.
Personality: He is a kind Trainer and person overall. He tries to do what he knows is right. He is always sorry for how he has done crimes others and will readily forgive anyone who apologizes to him for what he or she has done, although he would kill whoever tries to inflict harm to other people rather than let their lives be at risk or in pain. He knows how life is difficult and there isn't one person who doesn't deserve to go to hell, but cares about people and what he's going to accomplish in his future too much to want to kill himself.
History: He was born and raised in Saffron City. His family moved to Goldenrod City a few years ago shortly after he decided to challenge the Pokémon League, and he has been a brilliant Pokémon battler since he left. He has a younger sister and a slightly older younger brother. He travels to Johto to battle very often. A while ago he encountered a battler who secretly worked on the Project during a battle in the Saffron Dojo; he just finished a few rematches against some Gym Leaders and several other Trainers to train his team. After he tied against the Trainer with his Charizard's Flare Blitz, the battler knocked him out by getting him into a choke hold for a few seconds with a syringe filled with some sort of toxin in a corner of the room which was concealed by a curtain and kidnapped him from that point. While he was locked up, the Project worked on him as a test to try to create some sort of gigantic Haxorus merge who could grow up to several thousand feet tall by storing enough Dragon energy and launch large-scale attacks on cities; the minute extent to which this actually seemed to work was such a disappointment to the experiment that he was quickly deemed a failure and let go.
Flaw: He has to be extremely careful with how much of his energy supply he has; it's not to be taken lightly at all, and he could grow to an immense size and rampage violently and uncontrollably, be left comatose, or even die painfully, if he doesn't handle his use of Dragon moves correctly. He gathers an equivalent to about 3.5 Outrages (420 Base Power) per every hour. It's difficult for him to restrain himself once he collects 2.5 (300 Base Power or slightly over 40 minutes), and he can't suppress his other form at all after he has 2.75, but he hasn't worked to reach this limit yet. He often keeps himself in shade with his jacket. If he tries to use more than what he has left for any reason (such as to save someone's life), he'll die from it.