[quote=@mickilennial]
<Snipped quote by IAmTheIsland>
It is personal when you steal my character concepts, world building, and so forth. It's not legal plagiarism, but it is ethical plagiarism. 

Interpretations of character outlines or plot premises are not so much, but I have had people lift my sheet right after I exited a game and ceded all permission to their use.

[/quote]

This is valid.