Dave i would say a cleric for his personality but with his role in the story an inquisitor would probably fit better.
Tysons a theif for obvious reasons.
Sal i would say a monk, quiet calm personality and willing to give people benefit of the doubt and lookout for people.
Hoss is a bard being an actor and all charisma based.
Deans a knight, lower background rising up to be somthing better (like joining the police force) but has a naive dutiful streak like when it comes to dave and dates it must be perfect and done properly. Can't get the princess till you kill the dragon.
Rosswel would probably be a mage.
Not sure about Orlando mabey a summoner or blue mage even a cleric with his fear of ghosts and more unholy things.