Oh dear god they multiplied.
So in Berserker's Bride, we only ever see the eldest, Orvar being born. Since I don't know if I'll finish it, I thought I'd provide a spoiler of the other kids. Yeah Dagur and Hiccup have four other kids, much to the chagrin of the world. They're chaos wrapped in smart-ass. Not sure if I mentioned this, but I gave Dagur the family name Eldsen, Eld -don't quote me on this- being a Norse word related to fire- and "sen", being essentially meaning son a common part of Norse surnames. Red hair runs in the family hence calling themselves essentially sons of fire.
It's something of a private joke that Hiccup will look at her kids after they caused trouble and think 1. Her father is definitely laughing at her somewhere, and 2. Why the frick did she have so many kids? Dagur will then walk by without a shirt and she'll get all flustered thinking, "oh right, that's why." Also let's be real back in the day you had a lot of kids because you were expecting at least half to die before reaching adulthood. Hiccup had been content at four, the youngest wasn't intentional. Stupid sexy Dagur, lol. So a bit about each.
Orvar, aka Orvar the Honorable, the oldest, the apple of his family's eyes, of the five the best blend between his parents. Orvar is -mostly-sensible, level headed and decent warrior. Except for one thing. Orvar is TERRIFIED of blood. It may or may not have to with the fact that he was sprayed with an enemies life blood within minutes of being born, who knows. He was conceived shortly after Hiccup defeated the Red Death on the morning Hiccup was given the Eldsen family talon and the pair properly confessed their love. Orvar was then carried through a war with the Outcasts before being born in a dragon pen while his father was beat half to death. He grows to be heir to the Beserker tribe, as he was named by his father after living a month.
Sigrid, aka Sigrid the Sensible, is a as her name suggests, the most level headed of the children, usually the one keeping the rest out of trouble, including her big brother. Another private joke is that each of the children were carried/conceived/born under crazy circumstances. Sigrid was the only one whose conception, pregnancy and birth were pretty uneventful. Hiccup is convinced it's the reason Sigrid is something other crazy. She would be a baby after the time skip when BB tells the story of Race to the Edge. Despite being called the Sensible, Sigrid is the most effective warrior of the children. The others all know that, it's one of the reasons she can keep them in line. But she dreams of love and family, of marriage and children, rather than glorious death in battle.
Laddie, AKA Hiccup Horrendous Haddock IV, AKA Laddie the Mad, Hiccup was pregnant with him-Very Early Stage- during the events of the second movie. Laddie was also born early and weak as his mother had been. Luckily, Dagur had outlawed the casting out of hiccups years before so there was no objection to keeping him. The pair had gone back and forth if they wanted to brand their son with the name but eventually decided, eff the establishment, call him Hiccup and get him prove he was more. Hiccup had gone far despite being a hiccup, she wasn't even the first hiccup in her family to do so. To avoid confusion, they called him Hiccup-Lad or Laddie, for short. Basically Laddie is what happens when you mix Hiccup's inventive genius with Dagur's lack of regard for humanity. He's basically a mad scientist. For the most part he uses the name Haddock instead of Eldsen, since he's set to inherit the Hooligan tribe. Dagur still insist that they hyphen his family name in too.
Stoick Eldsen, AKA Stoick the Steadfast, the name Stoick was actually intended for Laddie, but since he was a Hiccup, they decided to hold off. He was the first child born after the events of the 3rd movie, still not sure how I was approaching that. Also, I never decided if Stoick I died during the second movie in BB but was a consideration. Stoick II is easily the largest of the children, towering over the rest in height and girth. Also, he's a big ol' himbo. While not oe to get in trouble on his own he was always persuaded to adventure by his siblings. Unfortunately, he was the least fleshed out of the kids. Stoick II is set to inherit the Outcast tribe, the one his mother won by right of conquest.
Dagny Eldsen, AKA Dagny the Wild, is the final child born t the couple. Like her brothers, her conception was under unusual circumstances. Something Hiccup simply terms was "a weird night", make of that what you will. Dagur whined that one child was named for Hiccup's father and one named after Hiccup and he felt he deserved one named after him. Hiccup reminded him Laddie's name wasn't because of her but his runty size. Dagur argued it didn't matter and Hiccup threw up her arms, saying fine, if we have another kid it's getting named after you. Dagny came along and Hiccup was slightly worried that Dagur would be annoyed his namesake was a girl, but as usual, Dagur was unperturbed. "We'll call her Dagny." And that was that. Dagny is as her title suggests, a wild-child. She goes on to explore beyond the archipelagos to the mainland, forging trade deals that benefit her brothers' tribes and has a hundred lovers along the way. Regardless of how many kids she has, no two share a father. To be clear, she is the main trouble maker of the family. Dagny very much lived up to her namesake.
Enjoy everyone!