Assumed in the past by Humans to be cursed or haunted objects, and otherwise assumed to be a type of Ghost Monster, "Living Dolls" are not at all undead and can be better likened to snails or molluscs. Their external body is not the true Monster, but a protective house that grows around them. As such, their "skin" is hard to the touch, and their natural DEF tends to be rather high.

Extracting the Monster from its shell is a surefire way to kill it, and it is very much a one-way process in that there is no way to put them back in in a way that will save them. They can survive for a time if the extraction process is not "too" physically traumatic, but becoming dust is inevitable.

Every "shell" is different. Some are more or less humanoid; some have and some lack detatchable parts.

In Bunny's case, he lacks a "true" face. Each "face" is a magically created mask, of which he has many in reserve for a variety of expressions, but getting stuck on one that doesn't match the situation at all happens often. A moment of obfuscation is required to change expressions lest the nature of this physical quirk (and exploitable weak spot) become noticeable to anyone with keen observational skills.

It is possible to forcibly remove his "face," but it is highly inadvisable as it is a surefire way to make an enemy out of a mad scientist.

The black spots on his external shell are also weak points. They're places where his internal body isn't covered by the shell, and as such, they're soft to the touch.