King Knight's, I love his. Definitely looks good with that almost demanding pose. Spectre, something feels off about his pose, I don't know... Plague Knight also feel a tad weird, but then again, his sprite in the actual Shovel Knight feels off in his boss fight in my opinion. Mole Knight is somewhere between being perfect and slightly off, I don't know, perhaps it's his proportions that are throwing me off. Love Treasure Knight, he feels sleek an solid all around. Tinker Knight almost seems a tad too intimidating, ha ha. I guess he needs the reputation boost though. Polar Knight is just great. Gives him the bulky look that he should give off. Propeller Knight, something feels strange with him. It looks good, don't get me wrong, but I feel like either his helmet or chest is off, I'm not sure why... Anyways, these are all great! I'm nitpicking for any constructive criticism, I would mainly recommend working on character posture and positioning in future works, the actual work on the sprites themselves are superb. I can't wait to see more art from you!