MetaKirby, also known as mtkb or メタカビ, is the romantic ship between Kirby and Meta Knight from the Kirby series.
On the western (primarily English-speaking) side of the fandom, Metakirby was initially the most popular ship. But in recent years this portrayal has died down in favor of the headcanon of them having a father/son-like relationship known as MetaDad (パパナイト "papanaito" in Japanese).
But of course not everyone follows that headcanon. Specially in the Japanese side of the fandom where is still a pretty popular ship.
If you are part of the group who still ship them, even in secret, feel free to join the fanlisting!
Pixiv Encyclopedia entry: Link