The tone a writer takes is referred to as the writing

Atmosphere or mood!
 i really hope this is it

That would be mood cuz the tone is what the writer makes the story feel like, for example say a wrter says something like "it was a long gloomy day" would show us the tone or mood is kind of depressing. The answer is mood tho.

You need to call the office. and then you need to give them a reason on why you want to change your username.