Children could have some fun banter, having less of a filter on what they say and having unique spins on things, being more creative then adults and such. Some characters obviously couldn't banter well with them if they are too serious or would be out of character to do such things with a child rather then just telling them to stop being a brat. It also depends on what classifies as a child. Naruto is 14 or something but is more reasonably acting like an adu-...okay, he doesn't act like an adult but other characters of his age do. I would say children would count as either before teenager or before adult according to the national standard for the US, so 17 and younger. If we go by that definition, though, I have mostly children characters.