I think Avicebron is okay, he needs a redemption arc similar to Paracelsus and LB 1 was a good opportunity. Plus the Golem was put into pretty good use imo
Atalanter is completely unnecessary. Patxii was all it needed for the emotional impact of killing off the Lostbelt. We don't need a ragey eposition edgy cat with crotch tattoo to tell us how we should feel