It's all themes at the end of the day! Each hue touches on a particular sort of broad category of persona, or dynamic, which influences their boon/blessing/bane. Beacons being fonts of hope and try-again determination, but ultimately being ESPECIALLY effective only a few times while others try to snuff them- Heartbreaker's taking the first and most direct routes to come to mind, and being very inflexible in diverting from indulging that impulsiveness. Soul-Possessed having access to an almost uncanny perceptiveness and knowledge, but ultimately being forced to live through a very real depersonalization/derealization at the hands of an entity who is ultimately alien to them, etc.
Boons are often a smaller, lesser benefit- whether passive or paid in guts, or single use, that players can draw on freely; blessings are more overt/potent, representing the core of the hue's themes as well as offering considerable influence or power. Banes are, on the other hand, the crux of those same themes- like flipping a tarot card upside down, and mirroring a hue's flaws in distinct clarity.
If you'd like examples from other TTRPGs that influenced this kind of thinking and approach, i highly highly recommend both Changeling: The Lost and it's predecessor Changeling: The Dreaming; both are games about the fae in the modern day, where player archetypes/fae-kith come with their own birthrights and frailties in similar manner to what i've written in Heartbreaker.