All classes struggle with their aspect in some way, this post is meant to detail how! I will give a simple summary and then give examples. I'm willing to listen to other interpetations as well.
I will only be covering 4 classes this post.
HEIR: Heirs want to connect to their aspect, but will experience the worst of their aspect
-In the epilogues, John isolates himself and detatches from reality believing nothing is real. Isolation and detatchment is the worst of breath.
-Equius becomes irrelevant, worst of void.
-Mituna suffers a traumatic brain injury and dies, worst of doom.
MAID: Maids are puppetted by their aspect and thus their true selves are hidden.
-Though current Aradia is free, as a ghost/robot she followwed the voices of the dead doing whatever was necessary to avoid a doomed session. But unfortunatly, she wasn't able to express joy. Her true self was hidden.
-Jane was literally puppeted by a life player she literally wasn't herself.
KNIGHT: Aspect is the root of their insecurities, they use it as a facade to defend themself.
-Dave, from my understanding, is a victim of toxic masculinity. He uses a cool *guy* facade to hide his insecurities. Masculinity relates to time.
-Karkat hates himself for his mutant blood and tries to hide it. His leader stiche is also a facade. And being a blood player is being a leader.
-Latula's *cool* girl stiche is a facade to hide her own insecurities. Being a mind player is about being cool and collected.
PAGE: Seems 'weak', other people feel like they have to help the page. Yet this stunts the page's growth and connection with aspect.
-Jake was always stuck in relationship drama. He finally utilised his potential in HSBC after turning on Jane. Becoming independant.
-Vriska's influence on Tavros prevented him from atually becoming strong. On his own, Tavros managed to raise an army. Since leadership sort of relates to breath [blood -> intentional breath -> unintentional] he finally managed to connect with it.