@Meow ♪
VRoid has facial expressions, but we can change those faces in VRoidstudio. If you change the smiling face to a vampire-like face in the facial expression editing section, it will make a scary face when it laughs in VRoidHub. LOL The face turns blue, the tongue sticks out, and the bats pop out of the body are called shape keys, and require Blender, a PC application. I added a gimmick that not only changes the facial expression when it laughs, but also makes a blue mask come out of the body.