I like your classpects for the omega kids. I keep going back and forth on a couple of them.

My initial thoughts were:

Yiffy - Thief of Rage

Tavros - Bard of Doom

Harry - Mage of Mind

Vrissy - Sylph of Blood

Most of these are just my own intuitions. I think the thief class is women specific but don't quote me on that. I am also a Yiffy rage player truther but I wouldn't be surprised if Tavros ended up being the rage player because Homestuck just likes to subvert expectations.