Let's say I make a playable character for use as an NPC. Whole gambit, create a.. level 3 sorcerer for example, the same way a player would. How do you calculate the CR?
If 4 Level 3 characters can walk into a CR3 encounter, then a single level 3 anything should not be CR3. Should it?
What level would you make a character if you want that one single character to be a CR3?