Character Evolution: Merrich 001

I am currently something like 2/3s of the way through Chapter I of Winter. The lead character, Merrich bel Caste has already undergone some evolution (some of which is rather unwanted)

Originally, he was to be a very average adventurer. Determined, somewhat rough, but with a solid goal in mind. Currently, though, he has come across simply as a more mature version of Uruz (id est quiet and polite, but less skittish than Uruz). This partially comes through in a scene where Merrich panics going back to where he is staying during the night (when wolves hunt anything outside). I tried to relate that feeling that you have as a child where a small fear becomes greater and greater the more you think about it, like getting up to go to the bathroom at night. On the way back, you always make yourself think something's chasing you and by the time you get to your room, you're running as fast as you can.
I'll remedy this feeling of fearfullness by exhibiting bravery in coming scenes and explaining that he has an extra reason to fear the wolves that stalk through Enic's streets at night.