One (maybe the only one) of the characters that does have a mouth animation is the "mad scientist." Not sure if there are any others.

What I have done occasionally is create alternate textures for a character with the mouth (or other) feature changed as needed. I then alternate between textures for talking, eye movement, etc. Not great - but better than just a dull face.

The texture for a character can be found in it's unzipped .a2c file. (I prefer to use 7Zip to decompress the file, but usually WinZip works ok.) Just copy it, make your changes, and load the new texture in the standard manner.

Also there are about 20 "walking" objects that come with ver 2.2 beta. While I don't recommend that version for general use yet - you can copy the character files s into the Alice 2.0 library and they work fine.