I was excited about them until I started using them and saw how much of a grindfest they were going to be, and how quickly they die..., decided they weren't worth the hassle and haven't called them out again.
I like them, but the whole idea of romancing Bas gives me gross teacher-student vibes because he's obviously not an equal partner. There are other NPCs in the game that are weak, but seem like adults. He's written as baby adventurer. Maybe Mirii is better.