a group of slaves brought to the training session

I've decided to bring in some fresh faces and find out of the four which one is worthy of a full training session. They all have potential, but I'm looking for that one thing that will make the right trainee stand out. We have vanity, meow, brat, and o as our new trainees, who are all fighting for top rank in this Audition. They are evaluated, questioned, and humiliated, then tested on basic protocol. This is the first day of a long week for the newbies.