I found out quite a bit of information, Ages 5-10 is commonly known as middle childhood. This is a time of major cognitive development. A Childs vocabulary significantly increases between these ages. They enhance their imagination and creativity and self care skills. Also at this age children learn to play fairly, follow rules, improve ability to cooperate and think morally.
This is also an important age for self esteem development which I think will come in to play with the way I portray my characters as there is quite a bit of speculation around how Ariel is drawn in Disney’s The Little Mermaid. Some say she is drawn in a sexual way aiming her towards an older male audience.