One thing I like to read into Feferi is that she's a much more overt look into how Alternia treats women than a lot of the other female characters. Here she is, right at the theoretical top of the blood food chain, and aside from feeding this big fucking squid - which has its OWN lofty expectations for its daughter - her life seems totally dedicated to keeping her arranged married husband* happy so that he doesn't try to commit megagenocide. Of course the first thing she does when her old world gets destroyed is break off that relationship and try to live life on her own terms for a little bit.

As others have pointed out, she then serves as a template for other characters in Act 6, which I like to think of as an Act that is largely about remixing ideas from earlier acts: Fefeta is kind of a symbol, if nothing else, through which the comic says "hey, I'm using bits of Feferi to make new and even more compelling characters". I won't go too deep into it just now, but I think this in general is an important part of Homestuck's structure: when we first meet Dirk, we're not meant to think of him as a totally new character, but rather as an extension of someone we already knew as Dave's Bro, but also as an extension of certain recycled troll archetypes - in his case Equius. Similarly, Jane is an extension of the Nannasprite we've already met, but she's also an extension of the child heiress concept we've already been familiarised with, so knowing Feferi gives us an advantage in getting to know Jane more efficiently.

Meenah (/ the Condesce, who I think is best treated as an extension of Meenah [or vice versa]) and Jane kind of take the Feferi concept in different directions, which is one of the strengths of Homestuck's "character alchemy". The Condesce I think is really best understood when we already have that background of knowledge about Feferi's childhood; we're told explicitly in Openbound that the Condesce was never really the top dog on Alternia, but even earlier on when we hear those stories about how English was like an overbearing demonic "husband" to the Condesce we can think back to Feferi's very recognisably female problems and think wow, yeah, I can see how even having the "highest" blood on the spectrum can't save you from being a girl. Jane, meanwhile, focuses a lot more on the naive privilege than the womanhood, at least on the surface - but when we see that dark inner side of her and we discover how fixated she is on becoming a mother and creating an heir, we can tell the shadows of that characterisation are still there.

(I dispute the claim about Feferi's "caged-animal philosophy" on the grounds that Feferi very explicitly does not try very hard to keep her animals IN the cages, nor does she care that much when they get OUT - but that could be a whole other discussion for this thread that I won't start just now.)

*I know this isn't exactly an orthodox interpretation of their relationship, but like I've just been talking about in the (anti-)meowrails thread I think there are shades of heteropatriarchy basically baked-in to the moirallegience concept; so when you combine the troll fixation on romantic destiny with the cutesy reference in Eridan and Feferi's introduction to them being "MADE FOR EACH OTHER", it can come across very strongly that there are socio-cultural forces compelling them to be with each other that go largely unexamined.