For your consideration, a fandom crossover.
Starring everybody’s favorite black-haired pointy-faced teenagers, whose sole reasons for existing are causing trouble for the people they love and distracting everyone from noticing that all their heroic deeds are performed in the service of cleaning up messes they themselves made.
Now, I just need all the fanfic.
I would love to see these two hook up in a story. Mayhem for everyone!