So this is my first article, which includes my theories on Rick Riordan's book, the Lost Hero. Feel free to read an rate...

Jason - Obviously our new hero. Seems to be suffering from memory loss. After a bit of research, I decided that this could be caused by Mnemosyne. Zeus and her slept together to create the Nine Muses. However, she also "presides over a pool" in the underworld, which is like the River Lethe. The interesting bit? She's the Titaness of Memory, and those that drink from the River Lethe forget their past lives. Could she be the ‘mistress’?
As for his relationship with the wind - and I think it is the wind, as opposed to the sky, as Riordan has never before mentioned a demigod son/daughter of Zeus being able to fly, and couldn’t just start now - could mean he is Aeolus, God of Wind. Otherwise, he could be a God of the Sky, like Uranus.
Judging by his conversation with Coach Hedge, Jason was meant to have known about his powers, hinting that he had been taught somewhere (“Did you do this?” said Hedge, talking about the storm). Hedge agrees with Percy that he’s ‘not supposed to be here’, so maybe Jason still should have been at the place, which could have been a Roman version of Camp Half Blood, but suddenly was sent to join the Wilderness School, after his memory was wiped (by Mnemosyne, perhaps?), and the memory of others was controlled by the mist, making people think they knew Jason. I could presume that something happened at this Roman Camp Half Blood, and Percy tried to save Jason, and so was sent to Annabeth (first person Percy would think of). Either something went wrong and his memory was wiped, or it was a side-effect of the travelling process.
Many people have noticed that Jason has been classed as a fast runner. Nike, the goddess of victory, who was known for her very fast running and was often depicted with wings , is a very strong contender.

Leo - Jason's best friend. Seems very fidgety and constantly busy. Maybe a son of Hephaestus, as he likes to build and make stuff, and is good with tools.

Piper – Jason’s girlfriend. Has an important Cherokee dad, who ‘often gets drunk’, and is now missing. She’s a kleptomaniac, which may hint her mother is a female version of Hermes – god of thievery. She also wears a snowboarding jacket in the desert... why? She also managed to touch the storm spirit. She smelled like cinnamon (a word which comes from Greek). I have found a relationship between cinnamon and the phoenix, but can’t find more than that – don’t ask me why I care, but the phoenix seems very cool.

A bit that also caught my eye was when Annabeth looked up, as if angry with the sky, and pretty much said ‘Why have you done this to me?’. Is Zeus causing problems again?!

That’s all I have to say for now... thanks for reading!
- JB21