Kaguya , Madara, and Gaara's mother seemed to use this.
Kaguya's hate for her sons stealing her power caused black zetsu to appear.
Madara supposedly had black zetsu as his will too...
Gaara's mother protected him, through his sand, even in death.
Sakura's true feelings, rivalry with Ino, and love for Sasuke caused Inner Sakura to appear.
And she is canonically a separate entity.
"Two minds"
Kaguya's hate for her sons stealing her power caused black zetsu to appear.
Madara supposedly had black zetsu as his will too...
Gaara's mother protected him, through his sand, even in death.
Sakura's true feelings, rivalry with Ino, and love for Sasuke caused Inner Sakura to appear.
And she is canonically a separate entity.
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