I've been curious... Why are Pages Active while Knights are Passive? Aren't Pages helper of other people and the Knight. Aren't they also weaker? Knights also seem to get more of the spotlight in medieval times.

It’s because of the way we work with the active-passive dichotomy around here. We’ve seen the most Passive Player use her powers in an incredibly direct and active way, while the most Active Player used his setting up an extremely passive chain of events to benefit him. This is deliberate too, showcasing the most Active Player merely benefited by their powers, and the most Passive Player actively using them, showcases the weirdness of the system.

However, there’s one thing that checks out with passiveness and activeness, and that is, who the action is meant for. The Greater Good, Others, falls under the ‘passive’ spectrum, and the Self, falls under the ‘active’ spectrum. As such for example, Vriska disregards others with her luck and information and relevancy manipulation, to benefit just herself. Feferi makes the Bubbles and cannot fathom why anyone wouldn’t want to dream with Eldritch Horrors- Her intention is good but her means are questionable. Likewise too, Jade is sweet and caring and loves her friends, but her suddenly blocking out all Temporal Shenanigans with her Password System, setting everything up without saying what exactly it was, even during the letters not wanting to spoil John, her just imposing her Dreamself on Bec without a regard for him OR her dead self. Hell she even explicitly states how she hates how Selfish Jadesprite is, and how she hates it extra-hard because she can see her as a flaw of her own.

On the other hand, even while using his powers actively, John uses his powers to put out the fire in his Land that saves the Salamanders, he uses them to dig the Tumor for Rose… Dave doesn’t even need to be explained, him and Rose, both of them are incredibly Selfless to the point of struggling to let the other go in their stead on a suicide mission. In fact, it’s only when Rose goes Grimdark, and acts out the role of a Witch, an active Class, that she’s driven by selfish revenge, which leads her to attacking Jack.

As such, the Knight-Page duality marks a really strange dynamic compared to the other Classes. The Knight SEEMS Active, because of the way they use their powers, and the Page SEEMS Passive, given they’re sort of pushed back and need to earn their potential. But Knights are defenders. They serve those around them, help them. They put on a facade to mask their insecurities- Dave, Karkat, Latula, try to seem reliable and powerful leaders to the point of suppressing the flaws they struggle with, and may end up pushing themselves too hard for the sake of others. Pages, on the other side? They don’t appear to do much, but they are the ones being served. Even against his own will, Tavros gets Vriska to ‘help him become better’, and gathers the Ghost Army exclusively to rub it in Vriska’s face, he didn’t even want to lead it to battle or do anything with it! Jake forces Jane, by his own mildly intentional aloofness, to be a third wheel in his relationship with Dirk and vent to her constantly until she’s burnt out. Horuss is keeping Rufioh in a relationship he doesn’t want to be in because he’s just too imperceptive to realize he doesn’t want to be with him anymore. Their actions, conscious and otherwise, benefit themselves. 

Ultimately, Knights are defenders, protectors, servers of those around them, whereas Pages are sheltered and trained, empowered, to one day grow up and become more powerful than the Knight training them. And in Homestuck, this comparison still applies- With the Knights we see doing all they can to ensure everyone is okay, while the Pages are sort of pushed slowly forward by others until they can show their true potential, at which point, even by other definitions of Active, they become a powerful active force to be reckoned with.