Fantasist (noun)

1. A person who has or creates fantasies.
2. A person who indulges in unrealistic or improbable daydreams.

Origin:

Late 19th century: from french fantasiste, from fantasie 'fantasy'.

Examples:

1. The young boy was a fantasist, always imagining himself as a superhero.
2. She was a fantasist, constantly lost in her own daydreams.
3. The novel was written by a fantasist, who took his readers on a magical journey.
4. The poet was known to be a fantasist, creating vivid and imaginative works.
5. Many artists are considered fantasists, as they bring their wildest imaginations to life through their work.