So, building on that part where Jake is collecting and exuding Lots of Hope Energy... is it possible for other Hope players to be overcome with Hope and show something akin to that? Or is it only because of the Page aspect? (Aka overcome with positive/Hope feelings and transmogrify it into the physical realm/Hopepunk?)

Pages may be a special case because ‘Serving’ themselves Hope and unlocking their true potential makes them arguably the strongest Classes. However, a Knight using a similar state to help others and Serve them could be an interesting take too, although arguably not as intense as Jake’s Hope Field. Alternatively, Thieves may stockpile Hope in a similar manner, so perhaps given enough Hope a Thief could reach Page-like levels of power, which as we know, is well over 9000.