Конечно, с удовольствием помогу вам написать сочинение про Карлсона на английском языке. Вот пример:
Karlsson is a small, chubby man with a propeller on his back who lives on the roof of an ordinary apartment building. He is very mischievous and loves to play tricks on people, but he also has a kind heart and cares deeply for his friends. One of his best friends is a lonely boy named Svante, whom Karlsson affectionately calls "Little Brother." Together, they have many exciting adventures and create unforgettable memories. Despite his flaws, Karlsson teaches us the importance of friendship and the joy of living a carefree and adventurous life.