Marvel: You're a Disciple of the Ancient One, How Come You Have All Sorts of Underworld Skills?

[Marvel fanfiction + supernatural abilities + innate dark magic body + lighthearted humor]

Charlotte transmigrates to the Marvel universe and begins her journey as an apprentice sorcerer under the tutelage of Kamar-Taj.

Just as he was diligently practicing magic in preparation for the impending arrival of the Chitauri army and Thanos, he awakened the [Dark Magic System].

From then on, all the magic he learned became sinister and terrifying black magic!

Other people's portals, with golden sparks flying everywhere, look incredibly sacred!

His portal is the Gates of Hell!

An eerie green ghost fire swirled around the Gates of Hell, and it could even open up the dark dimension to summon terrifying dark creatures!

Dormammu: I liked Charlotte the moment I saw him!

Ancient One: How come this kid is better at using dark magic than me?

Kaecilius: I might as well not join Dormammu, and join Charlotte instead!

Mordo: This is a heretic practicing dark magic! Capture him, you must capture him!

...

At this time, he recruited the Dark Dimension Lords Dormammu, Mephisto, and Sithon as his underlings.

Charlotte, now the new Dark Lord, exclaimed: What? Haven't you ever seen a Sorcerer Supreme emanating black energy before?