Daecon is a very skilled fighter, though he is not prone to violence and considers himself more a lover than a fighter. Growing up in an orphanage and being bullied led him to develop these skills, and when forced to, he will use them.
Daecon is not human, though he grew up among them. His true race is Shapeshifter, and he only just found this out the day before yesterday. He did not know such a race even existed.
Daecon undergoes both physical and psychological changes through the course of the story as his body and mind learn to use his newly discovered powers. While he was always in good physical condition his strength and endurance increase exponentially, and even his hair changes. As for his mind, well, he was always a bit of a meat head, but he is learning and becoming more intelligent at an amazing pace since his powers were unlocked.