Tewi: The normal answer is it's fine as long as you (and they) understand your tulpa is not the actual character. Tulpas identifying too closely with their inspirations can lead to identity crises and other problems, but otherwise there are no real issues. (Our entire system, and many others in this community, are based on characters in form, name, or even personality sometimes - although tulpas grow as people and their personalities will usually deviate from exactly matching their inspirations) (edited)