Kozuki Momonosuke

Momonosuke
Momonosuke is a person first mentioned in chapter 658. He is most likely the samurais son, because the samurai was asking if the giant children had seen him. He is mentioned to be a boy, adding to the likeliness that he is the samurais son.

History
Aparently, has a connection to the samurai head. Whether it being his son, or possibly even a companion.