is it possible to make the character I control plus size?
Unfortunately, no. It's solely for NPCs right now
oh ok then i have one more question, what should i do to buy the dungeon?
Have you beaten the Don?
This is Cassie's quest to gain her trust.
never seen this quest, how to do it?
Push the "5-Bits to pass guy" then sleep, come back to the Slums.
And I cannot stress this enough, Pick "GRUNT WORK" you can horny at another time.
Game should point you where to from there.