Scavenger - Sneakily comes into the smoke sesh never brings his/her own weed and expects to get smoked out.
The in the closet stoner - Most likely a parent who hides their weed smoking from their spouse and children. Tries to be stealthy as hell but eventually everyone gets caught.
The Giver - Supper chill and always has mass quantities and is willing to smoke you out no doubt.
Loaner - Loans weed to friends in need.
Papa Tokes - A father that is always down to smoke bowls with his kids and is stoned a majority of the day.
Add to the list.