The Larsen family were a long line of Norwegian pure-bloods, one of the typical anti-muggle pro-purity lines who looked down on those lacking in magic. They had a son, Kristoffer, who happened to be a squib. So, at the age of ten, when they'd lost all hope of him showing magical ability, they sent him off to an orphanage and told everyone outside the family he'd caught dragon pox and perished.
In reality, the boy thrived, adopted by a well-to-do couple in England at age twelve - one of whom was a squib herself - and receiving high-calibre education in Eton and Oxford. Eventually he met the very pretty, very magically adept Viola Macmillan, a recent Hufflepuff alumna.
They married the next year, a few months before Viola inherited ownership of her parents' popular sweetshop, and eventually went on to have three children. The eldest, Kellan Vidar Larsen, or Kell for short, was his mother's son from the start. Like his mother, he was a sweet child, able to endear himself even to the most wary of adults.
His first show of magic, however, came at the age of six, when he shattered a jar containing barley sugar because he'd been told his teeth would rot if he had any more sweets.
Kell's parents are slightly obsessed with him and his siblings living healthily, so while they're allowed as many sweets as they want, they have to make sure they do enough exercise that it doesn't affect them "negatively". Because of this stance of his parents', Kell grew up playing Quidditch, taking part in athletics competitions and swimming clubs.
At first, Kell attended Durmstrang, as his father wanted him to "get in touch with his heritage" and have more of an opportunity to practise his Norwegian, which was limited. #Bilingualproblems, right? All was great there, and his Norwegian did in fact improve.
Now set to start the new year at Hogwarts, Kell's looking forward to a new start.