Unfortunately the classification systems are built to be vague. I'm guessing what you want are examples.
Stranger powers can include:
Power #1: Unable to be recognized.
Power #2: When not focusing on their power, people will not notice them, nor remember seeing them. A type of psychological invisibility.
Power #3: A Thinker who can instantly know a person's personal safe, etc. password by talking to them.

Powers that lend themselves to espionage, as it said.