In the world exists a lot of puzzles based on variations of true-tellers, liars and normals (sometimes lies, sometimes not). There are plenty of names for these characters, for example see the questions (or many others similar around the Internet):
What is the most correct name for this puzzle and the characters?
What is the most common name for this puzzle and the characters?
What is the most popular name for this puzzle and the characters?
I know, this question demands answers strongly based on opinion, but still I would like to know, what do you think and why.
I believe a lot of scientific/popular literature about this logic puzzles exists, and maybe in this literature is some common/correct name suggested.
Also the first historical appearance of these puzzles could be the clue.