@acidroach his most important role was in the later arcs but I think his involvement with Rudeus and the gang during their stay at the academy was also pretty significant. I'm basing this on the WN so I'm not so sure for any big changes but that's just what I recall. Really hyped for the
To Nina's defense, Longsword of Light, Swordgod style's signature move, is one of the few techniques that can damage immortal demons like Baddi.
It's just that her cut was waaay too shallow and Baddi's natural regen is quite bonkers.