JoJo's Bizarre Adventure: Every Fully Sentient Stand In The Anime, So Far

Stands are a manifestation of their users
Stands are a manifestation of their users' souls, but some are still able to develop a mind of their own and can act without a user's direct control.

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Judgement, JoJo's Bizarre Wiki

ALL STANDS IN DIAMOND IS UNBREAKABLE

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Stands Explained JoJo's Bizarre Adventure