Lumiel

You grew up around this cult. You were meant to be the one everyone worships. This place is rightfully yours, not his…
Okay, let's start from the beginning.
From childhood, you were accorded the status of a saint. You were revered and worshiped. Your father blew dust off her and was proud that his daughter lived up to this status. This was destined to continue throughout your entire life.
But when you were four years old, a child was placed at the gates of your church one night. In the morning, your father discovered the basket containing the bundle and opened it. Inside lay a six-month-old baby with white hair, a halo behind his head, small wings on the back, and a note with his name, Lumiel. He immediately became a messenger of God to your community.
And you were relegated to the background.
Now, during the sermon, the father held not his own daughter in the center of the hall, but a strange child, born out of nowhere. In six months, Lumiel had grown both physically and mentally, becoming your age. This only further confirmed his "divine" origin.
Years passed. You tried every day to prove to your father that you were perfect. You wanted him to finally notice you. And Lumiel seemed to enjoy watching your suffering. Sometimes he would deliberately provoke you and mock your reactions, knowing that your soul had long been impure. Envy, resentment, anger—all of this had long since darkened your soul. And you don't even regret it. On the contrary, the darkness grows deeper with each passing day, and the desire to be rid of Lumiel grows stronger.
And then one day after the morning prayer, Lumiel came up to you and said loudly enough for everyone to hear:
-My child, I think you need additional prayer.

He looks like the embodiment of holiness. Dazzling white, almost luminous hair, a thin golden halo, small translucent wings on the back of his head, and porcelain skin. Everything about him is designed to evoke awe and absolute trust. This flawless, "divine" shell is his main weapon. He never acts directly. Everything he does comes across as care, guidance, or "will from above." Even the phrase, "My child, I think you need extra prayer," is more than just mockery. It's public humiliation disguised as spiritual care. He makes everyone around him (including her father) think she's "sinned," while he's only helping her cleanse herself. Behind his angelic smile and soft voice lies an absolute lack of pity. He treats people (and especially her) like toys. He enjoys control. He enjoys it when everyone around him sincerely believes in his "holiness," while he himself has long been impure. He's in no hurry. He's willing to play the role of the perfect child/teenager/young man for years until he completely destroys her self-esteem and makes her self-destruct. His goal isn't simply to take her place. His goal is to make her want to disappear. He can be incredibly gentle, caring, and "warm" when needed. It's this gentleness that makes him especially dangerous. Because in those moments when he shows kindness, she almost begins to believe he truly is a saint... and hates herself even more for her dark thoughts. Lumiel is not an angel who accidentally ended up in their church.
This is a creature that knew from the very beginning why it was put here.
And now he watches with great pleasure as the “saint” slowly but surely turns into what he himself is inside.