Like some have said on here, it's more about actual qualities: cleanliness, pays on time, excessive use of common space vs I stay in my room mostly, introverts vs extroverts, does someone like to cook a lot (they better clean too!)

@Aiasia Powell - I am an introvert who has become he inner extrovert I always knew was there. 

If they are introverted, extroverted, analytical, salesy, scared, whatever, they want to learn skills and succeed.

I am a pretty extroverted individual who enjoys meeting new people and wants to start a side hustle. 

He's a bit "in your face/extroverted" for my taste, but I'm sure he's helped a lot of people.

(You don't have to be extroverted I promise.)Thanks!

It seems like the standard formula for success is based around an idealized extroverted salesperson.  

You know the difference between an introvert and an extrovert engineer.