Rough draft
He was born in another dimension where the werewolves of his world were being hunted down and slaughtered for sport... For SPORT!!! He was born to two alphas, his mother was the first born to the of her pack's alpha but was the lone survivor of her pack. His father was alpha of his pack and welcomed J's mother into it with open arms, sadly the rest of the pack wasn't so welcoming... Well the females weren't. Some of the males attempted to her to force her into submission though after there first three attempts the pack head kep her at his side at all time so the females won't try to kill her either. Out of all the female J's mother was his favorite and so one night they went off alone and bred with her Giving her J. In his diminution werewolves would be born in there feral form to be able to give birth to three to four pups in one litter to keep there numbers up but given that he was the offspring of two alphas he was a only child.
The day he was born a group of hunters raided his den and laid waist to the pack leaking no survivors. A hour after the slaughter J was found hidden in the back of the cave as they searched for any they could barter and sell. They decided to keep him alive and see how much they could get for him. His captures thought it would be amusing to feed his the flesh of his kind and abuse him to see just how much a helpless pup can take. Two weeks pass and they set up camp just finishing there hunt on there way to the black market capital to sell there capture and all the pelts, fangs, and other "trophies" the hunters were attacked by an army of ruthless raiders.
The raiders were a little more understand of the value of life. They quickly over come the hunters with great skill and little blood shed. The thing is they two were on their way to the black market but their groups main profit was in slave so I am sure you know where this is going. (XD) The leader of this group of slavers was a princess, the bizerkor princess Belanor the demon crusher. She was the most feared female.. Most feared person in all the land with hundreds of stories and tales about her rath and rage. When she laid eyes on J she simply flicked his cage and it shattered in to peaces as if it exploded and the the force of this on flick sent him flying into the cliff face his captures camped aside. He laid there in fear of this mortal being of godly strength and from that day forth she kep him at her side and treated him as a brother (hints the name Brother J) till she found a home for him.
Sixteen years pass and he was a well groomed and behaved member of the clan and they returned to there village. He learned how to barter, battle, hunt, and once more to fear the princess. Despite all the stories and things he watched her do he was still dumb and spoke back to her and fifteen minutes later he was stepping out of the doctors building bound in bandages, his arm hung to his chest, a splint for his left leg, and brain damage (luckily for him she sees him as a non-threatening family who isn't after her throne or he would have been beaten till every bone in his body was nothing more then dust then throw his near lifeless body into the volcanic fire pit). That day a strange man arrived at the camp and something seemed off about him besides the fact they let him into the hall to have counsel with the princess Belanor. The man worn a dark cloak of fur with a golden chain that linked the two sides of his clock to keep it in place and he beard the scent of death. Normally J is allowed to sit at her side in his feral state to intimidate outsider who seeked to speak to her about ordeals or to barter and she found great amusement in there shock of such a massive animal at her side but something was deficiently out of place this time and it worried him.
The man walked out of the grand hall with Belanor and she explained to him that the man was a powerful lord who was taking him to live in a castle to protect two young princesses and there elder brother.... *sighs as he rubs his temples getting frustrated* Know what. To make a long story a little shorter because there is a lot to go through, the siblings were vampires and he lived with them for 20 year before somethings happen and he is drugged to the underworld to be forced to take part in the darkest form of dog fighting ever imagined. The beast in these fight range in all sizes and ablates from fox demons, tailed beasts, dread hounds, okamis, est. All to lead up to the king of the fights, one of the godlike, three headed hounds of mayhem and war, the cerberus. When he arrived he was given a trainer, the demon lord Samiael, who forced him to feed on the hearts of the fallen competitors to boost what power he has temporarily and gain some of the fallen ones abilities.... *growls* Or that's what happens for most in his diminution but a long lost secret of those with pure alpha blood (or a ungodly powerful beings like his trainer) is if one feeds apon the hearts of those similar to there kind they absorb there preys last remanning power, abilities, and adapt their form to match the fallen. For those with this ability are able to gain mutable forms to where there true form is nothing more then a babe to the power of another form (every bosses final form in games, movies, and anime). When Sam found out his new dog has a dark secret it excited him along with sending a chill down his spine as he thought of the power he will gain if he could survive the tournament. Sixty seven beast that were being prepped to fight for their lives other then him. Hell born, heaven bound, and mix breeds like tailed beasts and death hounds where what stood before him and the final fight with the god of hounds/guardian of the great gates. Three days later and the tournament begun with him getting the short end of the stick with his first opponent being a two tailed fire fox demon. After one groolling hours of well getting the crap beaten out of him be blacks out and the power of his first heart takes over by the soul of a dread hound, a beast known for being able to sniff out the weak points of an opponent and it's ability to distort its enemies visions to make it appear as a nightmare to them. When this happened the match was ended under five minutes with J dragging the fox corpse back into his cage before the soul of the dread hound revived J to collapse and recover.
Two weeks later after his first fight; he was fully healed, had nearly mastered his new powers, he was bound with a seal to suppress the souls of his prey, and it is time for his next match. He walks in to the arena expecting another nearly really feral mutt to find some well dressed human bodied asshole with long red hair holding a single rose. From what they said about his old life that he was once a three tailed fox demon that stole from once of the lords of the underworld and to avoid imprisonment he hid in the womb of a human which explains his human state but not the rose. (Anyways) they started the match and this fucker mutters something to himself before peddles begin to fill the air. J quickly extremely distracted like a playful puppy as the peddles suddenly fly past him and fill the air along with with the sweet smell of roses. Suddenly a throned wraps around J's neck ripping him forward towards the red head. It turned out this fox can manipulate plants and turn them into weapons (like another red head that at times is horny for the bat) but it seems he prefers his beloved rose whip. Sadly the fight was short given his last fight left him being able to burst aflame