Alright. Well let's say we need to introduce him to a non believer. What would be the circumstance for that? As for him. I see him as an ultra jaded too-old elf who is tired of the nonsense. He's mature, or at least more mature that the younglings surrounding him. As such he needs to always be in control and always compose himself as cool and collected. While he appealed to Charlie it was through reasoning, not through childhood wonderment which he is severely lacking now-a-days. So maybe someone that either a) brings the child back to him or b) someone who keeps him grounded and shows how reasonable they can be just like him.