Childlike

[Raeanne Dimick]

Someone who is innocent, pure and simple like a child
Someone who had been able to maintain his [innocence] even once he is [an adult].
Someone with innocent spirit who loves to have FUN!!!
note: being Childike is NOT being [CHILDISH].

[Ernesto]

(of adults) showing the good qualities that children have, such as trusting people, being honest and enthusiastic:

[Monty]

(of an adult) having good qualities associated with a child.