As "supplemental" material for a game goes, this Role (and accompanying components) creates an excellent package, providing everything you need to make the most of it.

The additional Desires really center The Imposter on its strengths, and the new Relationship provides a clear and intriguing way for another character (and thus, player) to get in on the scheming, while the two new playsets do exactly what playsets are supposed to do: Give you a really meaty starting place for your game. If I wanted to nitpick anything, I would wish that the characters in the playsets were in the document themselves, rather than solely in outlinks to Google Sheets, since while the latter is very helpful for online play, it adds an extra layer of complexity to the setup of playing in person.