1st challenge was a dance competition, TJ won.
2nd was hiding the chickens then collecting them in a box, whoever had the most won. Tay won and the chickens were taken to the garage.
3rd was bow and arrow hunting the fish, last one hit wins. They played this with Sam, Ben, Josie, Vance and Greg as the hunter for various rounds so lots of people won.
4th was getting in a sleeping bag in the downstairs bathroom and crawling like a snake to top bunk. Shinji won.
Voodoo Mama Juju (Trish) can steal points (or just subtract someones points, I can't remember) for chips, she can give you water/redbull, or she can read your future and give you a cryptic hint (useless I think)
Swamp Djinn (Fatty) can grant you a request but he will ask you to do something first. Not entirely sure how this will work since nobody has used it yet.
It was also implied there will be more NPC's added in the future
Edit:
Old Frank (Frank) has shown up and for 40 chips he will blockade/mess with someone else for that round.