Awakening a Shinigami Template in the Wizarding World, and I'm Aizen

Born into the declining Gaunt family, descendants of Slytherin.

Could Slytherin’s sunny boy really be a dark wizard who might cast the Cruciatus Curse at any moment?

Siren:

Dumbledore just has a little more magic, that’s all.

Voldemort? That Dark Lord who couldn’t even take over a high school?

(Not a caretaker)

Harry Potter fanfiction. No transmigration, a golden finger (Aizen template), and no saintly protagonist.