What’s your favourite problematic rarepair?

I’m curious to know if you guys have any problematic ships that are rare pairs like I do. For me I was very surprised to find out one of my problematic ships, Illumi/Killua was a rarepair, I thought for sure they would have more fics. The other rarepairs I like are from the ‘Silmarillion’ so as you can imagine they have even less fics. Anyone else have a ship like that?