RWBY: Before the series came out, Ruby and Weiss were shipped together constantly. This was most likely caused by the DeviantArt author LunarisFuryAileron, whose RWBY4komas were featured on Monty's Twitter a few times. This continued on even after Ruby and Weiss were revealed to have very different characterizations than what the fandom assumed.
Enough comments appeared on the Worm threads shipping Skitter and Clockblocker together that the author had Clockblocker explicitly sink it in canon.
Beyond Skitter/Clockblocker, other pairings like Skitter/Panacea and Skitter/Tattletale tend to be much more popular than canon pairing Skitter/Grue.
It would probably be easier to name the This Is It fanfics and fanart that don't ship the Notebook and Tony the Talking Clock. The two of them have never interacted, and they've never been onscreen at the same time for more than a few seconds.