I became an NPC in The Great Tomb of Nazarick Overlord NPC

This is an AU!
In a world where Earth is dying and humanity struggles, virtual reality games, especially the VR game YGGDRASIL, provide an escape. Momonga, the leader of a powerful race in YGGDRASIL, remains online as the game faces shutdown. Alone, he reconnects with a comrade, Bukubukuchagama, before YGGDRASIL's closure. Meanwhile, in Nazarick's ninth-floor library, an androgynous character named Thoth, a trapped soul, anticipates freedom as the game ends. Upon the game's closure, Thoth gains control of his movements and discovers his angelic form. As Thoth explores his new abilities and surroundings, a mysterious world awaits beyond the virtual realm. With an enigmatic library, magical prowess, and a goal to adapt to the new world, Thoth embarks on an adventure, uncovering his true potential and encountering diverse characters within the Great Tomb of Nazarick. As the story unfolds, alliances, conflicts, and loyalty to the supreme one, Momonga, shape the fate of Nazarick and its inhabitants in this virtual-to-real fantasy journey.
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I've only seen the anime, and have only read the later half of the LN (at which point, the story will be completely different anyway so it won't matter), so forgive any inaccuracies. Also, I don't know much about angel lore as an atheist, so I'm gonna be making up my own stuff.
Hope you like the story and have a good one.
Also, if you really like the story, here is my Patreon: https://www.patreon.com/MarAuthor