Yessss Okay :)

Ima - Dersite Thief of Blood
Derse is kind of a no-brainer for him his middle name is cynical and stubborn. I think Blood is also a pretty natural fit for someone who has formed his entire identity around his sister and their 'bond'. It also ties in perfectly with the thief class, who project complete confidence and have an unhealthy obsession with 'monopolizing' their aspect. Ima's ability to sow the seeds of conflict can easily be interpreted as him 'stealing' the bonds from the group, 'stealing' the opportunity for kako to form bonds as well. Stealing obligations and anything that might 'tie her down'. Thiefs also tend to embody the phrase 'the road to hell is paved with good intentions' and I think Ima fits the bill perfectly.

Kako - Prospitian Maid of Breath
Kako has the complete inverse aspect of Ima, breath. Its not just because I think its neat but it genuinely fits :). She's the optimistic flexible type, putting her squarely on prospit (sorry Ima you can't visit her when she's asleep) . Breath is associated with Freedom, but also indifference. Maids tend to start out quite deficient and reliant for their aspect (kako relying on ima for her 'freedom'), but their journey is about reclaiming agency. A realized maid (contrary to the name) creates or creates using their aspect. They're also wildcards which kind of reflects how kako and ima tend to do their own thing in some routes. Her airheadedness as well as intuitiveness feel like very 'breath player' traits