I thought the bats who lived in The Count's castle were cute, but they aren't main characters.
I also liked Grover, despite him never getting the blue guy's orders right at the restaurant. You know, I think the characters today are a lot cuter than they were when we watched it. I mean, Elmo's ADORABLE!!!!!!!
I also like one of the characters only seen on the Canadian versions, Louis the Otter. It was slightly after my time when he made his debut (I think I was 5 or 6), but I still watched it. I just didn't tell my friends