My source is technically a movie, but I don't identify with that as my source as much. I more identify with the "extended universe". But the extended universe isn't anything official, it's a fan creation based on an entirely different show. It's just any movie that features two actors from that show. But I consider the characters in this fan-made "extended universe" my sourcemates. But they're such little known movies that I'm never going to find sourcemates because even if they are in the extended universe, they probably think of their original movie as their source. And I don't think any of the "find a source" blogs can help bc of that.
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