1. Basics
If you haven't already done so, flesh this follower out as an NPC. Give them a name, develop their concept, and think about how you'll describe them. Add additional details if they seem important or valuable. See Creating NPCs for guidelines.
Andras is a young lad who's eager to become one of the village hunters.
First, we flesh him out as an NPC. I ask some questions of the PCs, and we learn that he's Padraig's son and just a few months younger than Caradoc. Caradoc's player also suggests that he fancies Blodwen, but hasn't worked up the courage to say anything about it. That's plenty to work with!