There are so many good characters, but any chapter with Wayne or The Lopen is a winner to me. I feel like if I had to choose my least favorite character, it would be the onscreen Lord Ruler. The offscreen Lord Ruler really did some crazy stuff, and I loved his whole lore, but the onscreen Lord Ruler, a full feruchemist/Mistborn who is a sliver who held the power with untold knowledge, just kinda went poof lol. The onscreen Lord Ruler is kinda a putz. You made me say it lmao!