Heffalumps and Woozles

Woozles and Heffalumps are some of the antagonists of the film The Many Adventures of Winnie the Pooh along with their partners.

The New Adventures of Winnie the Pooh
Woozles are an odd race resembling weasels (hence the name similarity) and their main objective is to steal all the honey possible. It is currently unknown if Woozles are bad or good creatures (like Hefflalumps) by Pooh and his friends. In The New Adventures of Winnie the Pooh, Woozles are seen and often mentioned by Tigger throughout the series. The only known woozles to physically appear in any Winnie the Pooh related media are a villainous thief named Stan, and a giant named Wooster. While Stan fulfills the original idea that woozles are usually evil thieves who have much in common with honey-snatching heffalumps, Wooster proves that they can be turned good, depending on the woozle's personality, and how they are treated by others.

My Friends Tigger & Pooh
In My Friends Tigger & Pooh, Darby, Tigger, Pooh and the others leave out treats for some Woozles, although no Woozles are seen or come. However, at the end of the episode, all the treats are gone and presumably eaten by the Woozles (so they could be nice or gentle creatures). If The New Adventures of Winnie the Pooh and My Friends Tigger & Pooh are both meant to fall within the same continuing storyline within the Winnie the Pooh universe, this could mean that much like humans in real life, some choose to make good decisions (like Wooster), and others choose to make bad decisions (like Stan).