I don't know whether this was already mentioned, but i think a rogue is too weak. Outside of combat he is pretty useful, but in fight he has a big lack of skills or abilities. Maybe he should be able to use little bombs or throwing knives (which would be craft able) more effectively, just like a ranger can use arrows. And maybe Larina should put in an alternative way to the Way of the Ranger. The new "way" could have a bonus on critical damage/chance and on lvl 5 the area where you can back stab enemies becomes a little bit bigger.
And maybe he could get some skills like he disappears until the end of the round and at the beginning of the next round he appears in an area (which you determined right when you used the skill) and deals critical damage to all enemies nearby, but you're action points in this round get halved.
Just some thoughts...