Li Yuan

Li Yuan (Lǐ yuán / 李源) is a chinese dragon who is about 1400 years old.

He has a lot of pride in his heritage which caused him to develop a bit of an arrogant attitude towards everyone that is not a dragon.
He enjoys traveling a lot, and throughout history experienced most of what earth has to offer. Despite that, he hasn't gotten bored of life yet - In fact, the opposite of that is the case.

Just because he can, Li Yuan has already played many roles in his life - From the frightening demon that he is, to a war god, to a simple student.
Nowadays hes a traveling mercenary, altough he only accepts commissions from other demons, no humans. His success rate is 100% which he obviously likes to emphasize.
Once he takes a job, he will make sure to see it through to the end, no matter how much work (or time) it takes.
After all, a decade means nothing to him.
Speaking of decades, Li hasn't really acclimatized himself well to modern times. While he does enjoy some modern fashion trends as well as neat treats like bubble tea, many things are a mystery to him still. Or a heresy.

While Li is a very strong demon, it needs to be said that his aggression level is rather low in direct comparison with others - he tries to avoid unnecessary conflict and warns his opponents beforehand.
If it does come to a fight, however, he shows no mercy.

Among his abilities is a very outstanding regeneration, no matter what kind of injury, he is back to his full body and strength within seconds. So he's practically immortal.
The one chance to beat him in a fight would be to endure...?
But who's gonna run out of stamina first, a never-ending recovering dragon or...??