There Will Be No Third Dark Lord at Hogwarts!

"I, Lynn, am a time traveler, and I come with a cheat code!"

Can you learn a magic spell at a glance? Don't be silly, it's just basic stuff.

"Old man! Pay me back my fishing rod!"

"I'm a bit bored... Time to go fishing!"

"The fish isn't hungry today...that must be it!"

...

Voldemort: "Dumbledore! Lynn possesses dark magic and gathers dark creatures; he wants to replace me and become the new Dark Lord!" (Serious face.jpg)

Dumbledore: "He's just a little too curious." (Drinking tea.jpg)

Lynn: "Dark Lord???!!! No, I didn't do it, don't talk nonsense, I'm a model wizard."

P.S.: The main character is unaware of the original plot; this is just using the keyword "HP" (Harry Potter).