..there wouldn't be.. by the time of heroes of Olympus all the demi-gods was going back to camp half-blood... at lest all that survived.... and this isn't like a short time frame later no this is a big set of years later, Percy, Annebeth, all of them aren't around anymore, and if they are they'd be old timers now.

so in other words the rogue demi-god thing still wouldn't work really.

and technically your the only player character in cabin 3 there is NPC characters lol.