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Want to Play a Ninja But Your DM Said No? Try Calling it "The Agent" Instead
http://taking10.blogspot.com/2016/02/want-to-play-ninja-but-your-dm-said-no.html

There's an unfortunate trend in a lot of class-based games to see a class as one thing, and one thing only. Sometimes you need to shake up the status quo, and remind both DMs and fellow players that there are a lot of ways you can rock a given set of skills.