I think many fan analysis forget the fact that Equius and Vriska where neighbors. which might mean their meteors crashed together or something. but they built their houses close by for a reason. with Spidermom being the dividing line between Equius and Vriska.

Equius saw Vriska feeding lowbloods to Spidermom from his window all the time.

Equius is also the person who gave Vriska her prostheses. Equius also hides the cue ball from Doc scratch.

i think their Lusues are also a contrast. Author is a butler who assists Equius in his things including donating his blood for Aradiabot while Spidermom forces Vriska to feed her trolls

Vriska and Equius live in a symbiosis as man/wife and lowblood/highblood. Hussie’s commentary on Equius’ introduction says the following:

Equius has a few things in common with Vriska […] they’re both blue- blooded aristocracy whose castes maintain both deep contempt for those lower and (especially in indigo cases) exceedingly high regard for those above. The fact that they’re neighbors suggests there isn’t that big a divide between blue and indigo in terms of status and daily life. Both classes probably cluster together somewhat in a kind of snobby symbiosis, since they’re one notch below purple-blooded clown hell […] And both are one notch above the jade and teal middling classes, which enjoy some status, but both castes revolve around more functional, municipal services …

in this way Vriska’s blue caste is almost vestigial, without any purpose in the Alternian hierarchy distinct from that of indigo nobility - which is why her “class” is that of an outlaw, the Thief. Vriska’s ancestors were once proud gamblignants, who offered the Zahhaks sanctuary in their territory; but now the gamblignants are dead, and Vriska hides within Zahhak’s pocket of void while offering very little in exchange. as you say, this is reflected in their lusii: Vriska’s lusus demands servitude, yes, but it is also a parasite which basically gives its troll nothing in return for a constant supply of food. other blue blooded lusii, like Ardata’s tick, further emphasise this parasitic nature.