@machomuu: Very Interesting Character so Far
@heretostay123: The personality is good now. As for the History, you need to add how he was told he was a Demigod, the Gods and Goddesses like to keep it secret until the child is in to much danger as from the Percy Jackson books. What all did he do in camp? How long has he been going there? Most kids with a few exceptions are normally in their teenage years or older in some cases, in fact only the children of Athena are claimed at Birth.
In fact I'd say we follow the fact the Percy Jackson made the Gods Promise to recognize their children at 13, they can be recognized earlier, in the case of my character when she was in danger, but lets say the age is 13 at the earliest unless you have a reason for younger or older