I do like binding blade as a game but even I can admit that some character's I may like have no purpose what's so ever so here's my list:
-Saul
-Dorothy
-Trec
-Wendy
-Ogier
-Sin
-Cath
-Sophia
The character's I listed either serve no real purpose in the story/ have no relations with other character's. Or they suck gameplay wise and no one would bother using them