Here are some adventurer classes I have used and designed into games. Some borrowed and modified, others made up, all can be interesting:
Abbot
Agent
Augurer
Botanist
Buccaneer
Charmer
Clairvoyant
Commando
Curate
Dreadlord
Demonlord
Dragonlord
Elder
Enforcer
Functionary
Fugative
Genius
Guru...