Jack Frost was a handsome boy, he had hair white as snow, eyes bluer than the sea, and porcelain skin. The frost spirit had scared the hell out of Hiccup when he fell out of the sky. Hiccup quickly shifted into his dragon form, a night fury, and barely caught the spirit in time. When Jack told Hiccup that he was only a decade old, the falling made so much more sense.
A spirit was born with many powers, but no control over them. The spirits had to learn how to use them and whether to use them for good or evil. Hiccup, himself, had taken a year to stop shifting at random. Then he took a good another couple years to understand the rest of his powers. He was able to speak Dragonese, mentally calm any being, and use his dragon flame in human form.
Hiccup was an old spirit and close friends with Manny – also known as Man in Moon. Hiccup was over 2000 years old and helped to protect the world long before the Guardians. Manny had actually asked Hiccup to form the Guardians and to lead them. The guardians were formed, but they weren't led by Hiccup. Hiccup was content being in the shadows and training new spirits. He picked St. Nick, the tooth fairy, the Easter Bunny, and the Sand Man to be the guardians and went back to hiding in the shadows.
He was isolated, but happy. Spirits found their way to Berk often enough though. He would train each and every one of them. The ones who ended up there always needed help – Manny must have purposely led them to Hiccup – and were always coming back after training to say hi to Hiccup. It was nice to have friends and to teach. He was, supposedly, a good teacher and many types of spirits sang praise to him.
The spirits that he trained were more diverse than any other creature in the world. There were seasonal, animal, and holiday spirits. The seasonal and animal spirits were easy to teach because he could either relate or they had a basis to relate to. The spirits that Hiccup had seen over the years were amazing. Some could turn into the animals that they were connected to, like Hiccup, meanwhile, others could only understand them. The seasonal had powers that could only relate to their seasons. Like father winter controlled the snow and northern wind.
From what hiccup saw, Jack was a winter spirit, but he also had something about his magic that was different from the other winter spirits. While most winter spirits had magic that caused fear or depression, Jack's magic made you want to laugh and play. It was a nice feeling and Hiccup wanted to keep it that way. Hiccup could tell that Jack was happy to get the help. He was crackling with energy and shining with happiness. Hiccup spoke quickly and said, "I want you to get situated, so just look around the island."
Hiccup started to walk away and Jack followed. They were walking through a village and Jack asked, "Where are we?"
"This is Berk. It's twelve days north of Hopeless and a few degrees south of Freezing to Death. It's located solidly on the Meridian of Misery. This will be your home and training ground until you learn to control your powers. You may visit as often as you want afterward."

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Spirit of the Dragon
FanfictionJack wasn't always alone. He was learning to use his powers. He lacked control and was scared to hurt someone. He found someone to learn from, but it soon developed.