Samuel character development - Hole of Losses

Samuel is a small size 10 years old boy who is visibly troubled with the fact that other 10 yo kids are bigger than him. He knows he's different, but can't find the truth behind himself. Since his foster mom Grelna disappeared misteriously, Samuel has to embark himself into the outside world in order to find her, a place that is not made for his size.
Along the way, he's going to find a lot of answers about his size, and even more stuff he probably shouldn't know.