User blog comment:Hulk10/Heather and Fishlegs/@comment-352641-20160701215725

I'm guessing that it'll be a plot for an episode or two to explain why Fishlegs starting pining after Ruffnut by HTTYD 2. There's a few possiblities I see.

1) Whoever took reign of the Berserkers after Dagur's imprisonment wants Heather to marry him in order to legitimize his rule as well as get rid of a rival claimiant. In this scenario, pressure builds to have her accept (say, because Berk needs the aid of the Berserkers against Viggo and/or the Defenders of the Wing simply due to manpower, or the new chief threatens to open a second front while Berk is distracted by Viggo in order to leverage negotiations), much to their irritance, but that's the politics of the dark ages for you and quite accurate to real life Vikings.

2) Same as the above, but instead they defeat said Berserker chief when Heather refuses to offer her hand in marriage and said chief decides it's better to kill Heather rather than have her show up later as a legitimate claimiant to the throne, but after doing so Heather has to go to lead the Berserkers lest they fall apart and all the associated chaos with a bunch of angry, lost-their-tribe vikings with naval mastery. Gives her a great exit (she's leaving to be a ruler), reason not to be around constantly or for HTTYD 2, and depending on Berserker custom might also explain why the two would have to drop it (if the Berserkers don't allow for out-group marriages that'd force them to stay apart). Mind this one could have someone on Berk suggest her and Hiccup get married to seal an alliance, but it gets declined (probably with Stoick and Heather pointing out that after how Heather claimed the throne, ultimately such a marriage would just mean Berk would absorb the Berserkers in that manner, and that'd cause too much upheveal/that's not how Stoick does his diplomacy)

3) The breakup is forced by Fishleg's family, who for whatever reason refuse to allow him to and instead force him to go towards trying to woo Ruffnut because she's actually a Hooligan.

Or perhaps, 4: Take 3, except Fishlegs' effort is in part more just going through the motions to keep his parents happy but eventually it got turned into a contest with Snotlout, but ultimately he's still holding the torch for Heather when it's possible.

Personally I think that 1 or 2 would be the most plausible, but I could easily see 3 happening and Fishlegs just gets pressured too much to be able to handle it (possibly with Stoick pointing out it's a terrible thing but if he intervenes he'll have an uprising on his hands for spitting on tradition, and they already had enough of that with dragons). Or Heather decides to remove herself until that calms down so Fishlegs isn't forced to choose between her and the Hooligans.