Sentient Weapons are a staple of many forms of fiction, to the point they deserve special recognition. They can range from the fantasy genre to sci-fi and even theoretical science. They vary in their level of sentience as well, but must function at least on a level of self-awareness beyond a typical robot or golem (as in having some form of free will) to classify for this category.

Also, in order to separate this category from Artificial Intelligences, please try to limit characters added here to those that were specifically labeled as weapons or had some kind of military (or equivalent) backstory/origin.