Yeah I picked Therion, who's kind of in a similar place of "easily replaceable". He's got great single target damage, but he's not great against groups, I subbed him as merchant and he's my SP/BP battery. Tressa subbed as thief would probably work similarly
I don't quite have it unlocked but his final skill damages all targets and scales based on speed so could be really good
Ooh, that's nice! I'm guessing it's Dagger damage? Unless it's the multi target of Wildfire