According to the Leyvnlearn of July 28th 2010 (the explanation starts at 4:10) , Party Members are characters that will travel with you on your journey through Levynlight.
Party Members are characters that join your party, traveling with you giving you advice and are involved in your cut-scenes and will have their own dialogue and interact with other characters that you encounter in the game such as Boss, Shop Keepers etc. The Dev's have stated that Party Members are not the equivalent of Larry from MouseHunt.
At this point in time, Party Members provide no benefits in battle, even though they may have Attack, Defense, and traits on their respective cards.
Party Members were renamed Quest Companions, and then Travel Companions in a attempt to avoid user confusion.
The Travel Companions in the game include:
|Levyn||Enrick||The Scarred Man||Zeruul||Elven Goblin|
|Chapter 5-6||Chapter 6-8||Chapter 9-11||Chapter 11-12||Chapter 13-|