A fellow player in a game that has run for 4 years now has become more and more inconsistent as time goes on. I wouldn't normally be worried about this, however, the player in question is playing a Paladin, which is what is leaving me confused. The latest instance of this which flabbergasted the GM and myself is as follows:
Character confesses he has wanted 'since he was a child' to help put an end to a mystical environmental anomaly that has existed for over a hundred years and resulted in two races losing their home and threatens to do the same to another 7 (not to mention various dragons, etc). The character did not mention this at any other time before this.
Six months later (about an equal amount of time in real life), the group receives a large amount of potentially unique information about the interior of the anomaly, including information on how it's mutating local fauna, wildlife, and the people lost inside. This character and player both reacted with non-interest at the new information.
I usually wouldn't mind the inconsistency, but it does make it hard to role-play with the character if I don't know his goals and aspirations. Plus, there is the other issue of him being a Paladin, which are usually seen as the model of consistency (though that may be a bias on my part).
Now we have hit level 20, and are starting to be in positions to have major and lasting impact on the world as a whole. How do I, as a fellow player, work with this player to bring him back to being more consistent? Or is this more for the GM to handle?