For the characters of the series, Mashima drew upon people he has known in his life. In establishing the father-son relationship between Natsu and Igneel, Mashima cited his father's death when he was a child as an influence. He took Natsu's motion sickness from one of his friends, who gets sick when they take taxis together. When naming the character, the author thought western fantasy names would be unfamiliar to Japanese audiences, so he went with the Japanese name for summer; Natsu. Mashima based the reporter character Jason on American manga critic Jason Thompson, who interviewed him at 2008's San Diego Comic-Con, and another on an employee from Del Rey Manga, the original North American publisher of "Fairy Tail". He based the humorous aspects of the series on his daily life and jokes his assistants would make.