Percy and Nico should scale to Hazel sinking an island through manipulation of their powers, Percy Casually wrecking Hubbard Glacier, Nico causing tremors strong enough to Collapse structures, Percy collapsing tunnels in The maze with tremors, that would lend credit to them scaling, especially considering they were more inexperienced then.
Percy and Leo should scale to Mt. St. Helens alone but only in heat resistance, this is because Volcanoes errupt with Thermal Energy and their parents Nature give thembheat resistance which is why Percy could fall in magma and not instantly burn to death like the monsters.
Its because of this that Jason and Thalia shouldn't scale being as When Jason was possessed and blood lusted, his lightning stike inly momentarily dazed Percy with only steam emminating from the area he was hit. The Force behind the bolt is what's more impressive, not heat behind it, because poseidons Nature keeps Percy from being vaporized.
Also in that is Percys best strength feat since him clashing with Kronos on Brooklyn Bridge. Him and Jason were causing noticable tremors. Tremors are Generally felt at roughly magnitudes of 3.0 which can be produced by half a ton of tnt according to this:
http://alabamaquake.com/energy.html#/
Which is more believable and in line when considering The power Kronos showed in their battles with CoA Percy and their clash was verafiable more stronger being as their tremors threated to Collapse the Bridge. To produce tremors capable of that, thats when 6-C and Higher is scalable to physical stats, so Kronos and Hyperion should Scale physically and CoA Percy, not Krios because of losing to Jason alone, but again, Krios is the weakest and given the Demigods feats of strength and what not, its implied Gods and such are simply able to be harmed by Celestial Bronze and Imperial gold regardless of the Demigods strength and that certainly is the case as Book 1 Percy at 12 years old couldn't have had the strength to Harm Ares who being a full powered major god would at least scale to weakened Titans. What proves this even more is that Thalia, Luke and Annabeth at around the same age were being toyed with by a random Cyclopes despite having more real world experience. Island level cyclopes? Nah...
Thalia should only scale. Nico, given his age and diet shouldn't yet.
Unfortunately, Percy Jackson isn't a Graphic Novel officially. It'll take some weeks if not longer to go through the originsl 5, Heroes of Olympus, Side books like Demigod files and Demigods and magicians, etc, Trials of Apollo and Magnus chase....ƒÿó