I mostly just want Sebastian to suffer the frustration of being too short to reach the counter, to be honest.
But that aside, it could be an option for characters without enough backstory to even guess what they were like as a child. Another option: a character turns into a child physically and mentally but still retains memories of their time in the game, CR included, only it's altered to make them believe they've always been a child while here. If someone doesn't want to deal with the "newly arrived confused child" aspect, that is.