Rahat doesn't cry that much, but they did when Qam almost died. And also this one extra, when they're stressed, I feel like they'd have the occasional nervous breakdown where they cry a little.
Qam cries more, at first because they were miserable from the stress of their job and how pointless everything was. But at the end of daydreamer because they're kinda overwhelmed by the amount Rahat loves them. So both Qam and Rahat cry pretty freely.
Alya I think would cry at a sufficiently dramatic romance show, but reacts to trauma first with anger and violence. This happens a couple of times, first when they kill a coworker who was threatening to kill them, next when they lash out at qamar who probes them on their unhealthy habits and most recently when they attack the curator who mentions their painful upbringing. This way they never truly confront the trauma and thus doesn't get catharsis - which is usually what crying is. Later in the story they will have more time when they're forced to process the hurt, they manage to break through the other side of their anger and finally cry about all the garbage they went through, and are more healthy as a result.
Najm, similarly, doesn't cry because they also don't confront their trauma. Instead of deflecting, like alya, they dissociate, the world stops feeling real to them, they don't feel real, they go into a haze and when they come out of it the trauma feels distant and dream-like. Less tangible. If they were taken out of their constant-stress environment and left to recover for a while and then were confronted with their trauma, if they managed to process the enormity of that awfulness, and the amount of hurt they caused. The pointless loss of it all, then they'd cry.
