User blog comment:SayuriDarling/The House of Hades Official Discussion/@comment-24067344-20131022173322/@comment-4727448-20131023020640

Percy, all day every day. If they all fought each other, they would lose in this order:

Piper (just basic swordfighting skills, charmspeak not withstanding)

Hazel (strong in her own right, but still not as powerful as the others)

Leo (fire and throwing workshop tools can only work so long)

Annabeth (she's a good tactician and planner, yes, but her fighting range is limited)

Frank (son of the god of war, physical strength, good weapons skills)

Jason (definitely almost as good as Percy, but would get tired first)

Percy

And why Percy would win:

Well, I've stated why everyone below Jason falls out. Jason and Percy are almost equal in power, Jason might have powers beyond what we know, but based on what we know so far, Percy would win (logistically speaking). If you put them in a fight, blade to blade, Riptide's longer range would cancel out Jason's whatever's shorter range. If you add all their inherited godly powers, however, it does nothing but tire both sides. Percy, however, is older, whereas Jason is said to be taller. Based on this, it is safe to say that Jason would exert himself to the point of no return in order to attempt to beat Percy, while also enduring Percy's attacks. Percy would also be affected by both of them using their powers in the same way, but the chances are that he would be able to stand his ground longer. Kind of a pity their battle never ended, though.