Babidi (Dragon Ball Z) has branded Dabura with the Majin symbol, turning him into his servant.
Those branded by the fal'Cie (Final Fantasy XIII) become l'Cie, the fal'Cie's human agents and slaves to their will.
Talion (Middle-Earth: Shadow of Mordor) using his Brand power to enslave an Uruk's mind.
Orochimaru (Naruto) has branded Sasuke's neck with the Cursed Seal of Heaven, corroding his body and mind with the intent to make him Orochimaru's next host body.
Phantom marked Alviss with the Zombie Tattoo (Marchen Awakens Romance) which would give him immortality and put him in a brainwashed state where he'll be forced to remain by Phantom's side for eternity.