Do you want to write a story? Have (nice guy) be pulled into getting (worthy thing), then fight (bad thing), then (worse thing), then (boss fight). The experience of doing this changes the (nice guy) by making (him) more (emotional reaction).
Provide a sidekick for emotional balance.
I’ve been sending stories out since 1989. It’s only been in the last few years that I’ve realized it is this simple. I’m plotting out my newer novel, a Space Epic with humor and body horror, using this article.