Generally when there's a group of works that are all set in the same continuity, characters can (and do) crossover from their home series to other ones fairly freely. Sometimes, however, within The 'Verse, there are Canon characters which, for whatever reason, can't be used in any other work outside of their "home" series. These characters are Exiled from Continuity. Although they're most frequently found in Comics (especially superhero comics), such characters can also be found in other forms of media. Such characters inspire many a writer to create a Captain Ersatz or an Expy for the character they can't officially use or to try to skirt the issue with a Lawyer-Friendly Cameo.
- Content Reasons
- Licensing Reasons
- Legal Reasons
- Creator Reasons
- Commercial and Corporate Reasons