Note that when Hiccup does an impression of his father, he affects a Scottish accent. For some reason, all the adults of Berk are played by Scottish actors like Gerard Butler and Craig Ferguson, and their characters speak with Scottish accents. As long as it's consistent, who cares what kind of accent they have, right? Except that it isn't consistent. This is all well and good, as it takes place in a fantasy foreign land, and these characters probably wouldn't even be speaking English anyway.
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We're real sad that Stoick died in How to Train Your Dragon 2, but honestly, that movie didn't have room for any more subplots. Perhaps this is why some other ongoing animated franchises have left out major characters in later installments when they're no longer relevant, such as the almost complete removal of Fix-It Felix and Sergeant Calhoun from Ralph Breaks the Internet and the dramatic reduction of the cast from Toy Story 2 to Toy Story 3. And if it wasn't crowded enough, the second movie also adds Hiccup's mother, Valka, and Eret the dragon trapper. The rest sometimes get the occasional middling joke or forgettable subplot, but that's about it. Most rarely have anything to do, with the possible exception of Astrid, but she only exists as Hiccup's love interest. Because of this, the writers just don't seem to know what to do with the profusion of supporting characters in the later films. It wants to be primarily about the friendship between Hiccup and Toothless.
But this series is, at its heart, not an ensemble story.