Ruffcup is the name of the pairing between Hiccup Haddock and Ruffnut Thorston from How to Train Your Dragon (2010). It is not a popular ship in the Big Four fandom, but there are still many who support the relationship. This can be considered the flipside-pairing to Tuffcup, as well as the other half of the unorthodox Twincup.
In the film, Ruffnut and her brother Tuffnut join in Snotlout whenever he is out to ridicule Hiccup, only to join in as Hiccup's fan when he begins to excel in dragon training. Fans began to catch onto this pairing when, after Hiccup's secret is revealed and he gathers everyone in his plan to save the village, Ruffnut came close to Hiccup to flirt with him, only for Astrid to tug at her braid. This interest in him however did not carry on in the show.
Note: Please add only ones that are part of the RotBTD fandom
Can't Buy Me Love by I am Number 5
Found on Fanfiction.net @: https://m.fanfiction.net/s/9432126/1/