Regardless of genre, one quality of a good game is
that you are constantly presented with a series of interesting choices.
Throughout Lionheart, you will be presented with many such choices, and
given the ability to decide how to drive the story. These choices will
allow you to assume different roles and develop your character in
different ways. We are trying to design the game to allow for a wide
variety of playing styles.
You bring up a good point about playing a diplomatic Inquisitor. By
choosing careful dialogue options, you can talk your character through
some situations, where it makes sense. As mentioned, there will be
combat situations you can avoid and different ways to defeat certain
enemies. There will also be some areas with creatures that are
incapable or unwilling to engage in dialogue - tread into their domain
and it's possible you might have to do battle.
This was from Cabal, one of the Reflexive people who are making the game. You can read the whole thing in this thread.