American Comics: The Battle of New York from the Start, but with a Decepticon Battleship

[No CP + Protagonist Growth + Satisfying + Harry Potter, Marvel, Pacific Rim... (Leave a comment to choose the worlds you'd like to see)]

After transmigrating into Hogwarts for eighteen years, the laid-back witch Seli Buluofen, whose name was the same as that of a certain fever-reducing medicine, thought her life would amount to little more than outwitting Voldemort and living peacefully in the magical world.

But fate loves a surprise. A commission driven by greed sent her one step beyond Hogwarts and dropped her straight into the perilous Marvel Universe!

She was completely bewildered from the moment she arrived.

Where were the superheroes and the Chitauri Army, the alien invaders she'd been promised? She looked up and saw a monstrous Decepticon battleship looming over New York, with a mechanical tide sweeping across the entire city!

This Marvel Universe seemed wrong from beginning to end!

To find her way home and, while she was at it, get back to tormenting the noseless Voldemort, Seli began an absurd journey across the myriad worlds.

But the further she traveled, the more bizarre things became. What do you mean the deep-sea monster from Pacific Rim is actually Gatanothor? And what do you mean the heartwarming daily life of Despicable Me is hiding a cross-dimensional incursion by the unhinged Rick and Morty?!

The worlds across the myriad planes were all mixed up, their rules in ruins and their plots a complete mess.

The laid-back witch finally gave up on trying to stay laid-back.

If the whole world was out of whack, she'd set everything right with her own hands!

She traversed the ruined worlds and swept aside one bizarre, jumbled plot after another. Seli had just one goal: return to Hogwarts and give Voldemort an enormous surprise he'd never forget!

This book is also known as The Old Voldy, I Crossed the Myriad Worlds Just to Surprise You.