These *are* seriously nice. =) Obviously the pixel tech is a little loose, but the overall design is just spiffy. MoD pretty much covered any crits I might've found in the sword guy (selout). Well, not totally true -- the edge doesn't look smooth enough to be sharp (I'd guess inner aa would help here). Hrm...
oh yes -- the other thing is that handguard's a lot bigger than his hand. It makes it look like the sword is TOO big, instead of having a stylistically long blade. Either way works, just decide which you want

On the rabbity guy (whom I love unconditionally, by the way) I have only two suggestions at this time:
1. The gripe of a person who pretends to know something about combat -- for a proper side kick, shouldn't the knee be outside the center line of his body when he chambers for the kick? Right now his knees are all crossed up, putting him regrettably off balance. I would not like such a fine rabbity guy to be knocked on his rear.
2. The impressive folks around here do a fancy thing called unifying t3h palette. Near as I can figure, it involves using some of the same colors throughout the piece. In your case, I guess that would mean using some of the pants color as shadow on the skin -- it sort of gives the impression that all the elements of the sprite exist together. When they have no colors in common, they look very separate...or so I understand. In any event I'd give it a shot and see if it looks nifty.
P.S. That fire is pretty.
P.P.S. What happens to his (HIS) right arm, when he kicks? It seems to disappear.
P.P.P.S I am not digging the pure black eyes on the sword guy. I do like how dapper he is, though. =P