@Nematoda
Uh.. not really..? ^^;
It seems like you took it in the negative way, which is not exactly what i think..
For example, if you read Hamefura manga, I also just think of Katarina as a full child inside out during her time as an 8 year old "Katarina" because her behaviour.
In her past live, she's already a teenager. But since she's childish, might as well think of her as a child.
Or at least, i think of it this way. I can't really explain it tho.. XD