hm.. well the power hazel shows and the thing that Thalia did was two different things technically... Hazel had promise of magic, the goddess of magic had seen it, and so on. The thing Thalia did was a simple manipulation on a very low level against a mortal, just to make them believe that they was students and not random kids walking into the school, hazel can do it on levels that would trick even gods and so on. Most can learn the ability to manipulate the mist, but their innate talent will determine how well.
Well this rp is based off a specific series and this series has no demi-titans or anything sense the series is based more on full on real greek/roman mythology, with very slight changes... and I know Chiron says that. But the entire purpose of this roleplay is to center around campers at camp half-blood, meaning the really only thing you can be is a Demi-God/Goddess, in other words a Half-blood, sense anything else would mean they are completely separated from the others for Who knows how long, and other things would just fight any real hope of the roleplay staying on track let alone surviving.
So pretty much you can only be a Half-Blood, now I never gave a limit to what god/goddess they can be a child of really, except oblivious ones, though some wont be as powerful as you would believe from what their parent is, though I will say there may be a god/goddess or two who are called that but aren't technically a god/goddess that has half-blood children.
i'll have an OOC up sometime, either in a short while, or in a few hours, depends on what I have going at the time.