Naruto/Harry Potter idea #1
Kind of weird but could work well in the right hands:
When Anko Mitarashi dies she is reborn in a form she never could have expected; Salazar Slytherin's basilisk!
After thousands of years of magical sleep, being awoken and mind controlled, then awaking 50 years after that, Anko is understandably confused.
During the chamber incident, Harry trys to speak to speak to her and it works. Finding he's the only person who can understand him, the two become tentative friends.
Expect a lot of teasing from Anko, both sexual and verbal, even in snake form (don't see that stopping her in the slightest)
She would eventually return to human form, until then maybe a really powerful shrinking charm.
She would call out any magic bullshit, get Harry to stand up for himself, encourage him to sleep and drink around, make him like her basically. Ninja training included.
Maybe she makes him have sex with her, maybe not. She would be desperate after 1050 years, but she may not be like Oroichimaru.
I might work this into my VideoGame Harry story. It might not be Anko, but the basilisk would act like her enough to warrant being called that by Harry.