It's been a while since I've uploaded one of these, welcome back guys.
So the idea is pretty simple.
The MC will be Jiraiya or will have a personality similar to him and will be in the Harry Potter World.
I think it would be best if the story focuses on comedy and tries to fuck with canon as much as possible.
Have the MC write a SMUT novel for Wizards and be a pervert just like Jiraiya is in Naruto.
I think it would also be a good idea if the MC was a massive troll and annoyed the teachers, perhaps have the MC become a prankster with the Weasley Twins.
Could have the MC create his own spy army.
Animagus: Nine Tailed Fox
Patronus: Toad
I also think it would be best if the MC was a muggleborn so you could have the MC troll a lot of the purebloods.
Plot line wise, that depends on what you want.
I think it would be refreshing to have an MC with Jiraiyas personality in Harry Potter cause I've never seen it done before.