Jura Rogar was born in the foothills of Mount Drearc, an area famous for wyvern attacks. When he was a child, he would always stare in wonder at the dragon hunters that would come to their village every few months. The village would hire them to drive back the wyverns whenever they got too close to the village and began to take livestock.
Jura Rogar was clearly not born on Earth, but on a similar, parallel dimension. This dimension is just like ours, but for the fact that dragons and similar creatures exist. Because of this the dimension's technological advancement was stunted, and they are only now reaching industrial revolution levels. The only technology that is close to that of our present Earth is that of one thing, hunting dragons.
As a young man captivated with dragons and dragon slaying, Jura's choice of occupation became clear when his village was burned down by a massive fire breather from the other side of Mount Drearc. With no money and no home, he was picked up by the hunter that slew the beast that burned his village. His name was Dragonslayer Lapen, and he was one of the best in the business. His training was harsh, but Jura endured it, and at the age of 20 was sent into the ranks of Dragonslayers. Each Dragonslayer was a mercenary, hired to kill beasts for some reason or other, and Jura was no different. He was made fun of at first for utilizing a combination of swordplay and massive firearms, but he soon remedied this with his amazing results. He became a famous hunter. "The Dragonkin" they called his fighting style; he breathed hot lead at range and tore with a massive claw sword when his opponents got close.
Years into his career, he, along with several other experienced hunters, were hired to take on the largest dragon ever found. It was a gigantic beast a thousand meters long, with white hot fire that burned steel as easily as paper. It was a flightless monster, so they decided to ambush it in the canyon, and set up countless bombs and traps. They laid in wait for hours, but soon heard the rumbling, rumbling that shook the ground. It wasn't long until they saw it, and not one of them was unafraid. It was easily a thousand meters long and filled the entire canyon as it passed, even scraping some of it away with its razor scales. They watched as it got close enough to trigger their traps, and the canyon was rocked with explosives, bullets, poison, and spikes, but the beast was barely even phased. The hunters pounced, beginning their attack, but none of their weapons could hope to pierce it's armor. None of their weapons except one that was. Jura's custom made rifle was absurdly huge and enchanted to pierce dragon scale like no other, and as he fired bullet after bullet, they pierced the dragon's hide. It roared its dissent and breathed forth a terrifying torrent of flame that melted the walls of the cannon and killed any hunters daring to get near. Jura was one of the few left, and knew he had to work fast before the dragon killed them all. He jumped down onto its head and began firing straight down into its brain, but its skull was too thick for his bullets, already slowed by the monster's incredibly thick scales, to pierce. It rocked underneath him, and he fell, landing right in front of the dragon's maw. It opened its mouth, and Jura stared into hell itself. Suddenly, there was a bright flash of light, and Jura knew he was a goner.
But instead of the afterlife, Jura found himself in the middle of modern day Earth, May 2005. Now he works as a mercenary, as was his trade before. Only now, the game he hunts is much different.