It can enhance their language skills. As they listen to various stories, children learn new words, sentence structures, and how to express themselves clearly. For instance, if a story has a lot of descriptive language, children will pick up those adjectives and adverbs.
They probably have a rich family history. Since they like to tell stories, they must pass down family traditions, anecdotes, and lessons through generations. For example, they might tell stories about their ancestors' adventures, how they overcame difficulties, which can be both educational and entertaining for the younger family members.
Another onmyoji that might like to tell stories is Abe no Yasuchika. He was part of a family of onmyoji. His life was filled with different practices and encounters. All these could be turned into stories. He could tell stories about his family's traditions, the spirits he dealt with, and the magic he performed.
There could be a made - up character in a role - playing game or a very niche piece of fiction that is a 'demon quiz' who likes to tell stories. It might be an original creation by an author who wanted to add an element of mystery and intrigue to their story. Maybe it has a unique appearance, like having multiple eyes and a forked tongue, and it uses its storytelling ability to either entertain or terrify other characters in the story. It could also be that the stories it tells are a way to pass on some ancient knowledge or a warning to those who listen, but in a very cryptic and convoluted way.
They are often very observant. For example, they notice details in the spiritual world that others miss. This gives them a lot of material for their stories. They can talk about the different types of spirits they've seen, like the mischievous kodama or the more powerful oni.
Some kids like to tell long made up scary stories at sleepovers. They might be inspired by horror movies or books they've seen or read. It's a way for them to have fun and spook each other.
Elders often like to tell the old old story. They have a wealth of life experiences and memories that they want to share with the younger generations. It gives them a sense of purpose and connection to the past.