Maybe Silver Fang? Also known as Ginga: Nagareboshi Gin...

But surely anime is not suited for any five year old kid...

Maybe Fruits Basket. It's full of humour, morale values and is a good drama in general. Although some say it is mainly for girls... well heck, I don't care, it was fun as hell and very interesting.

Story if you don't know: It's about a girl who has been living in a tent since her parents both died. Her tent is placed on land that is owned by one big family... They don't discover that she is living there at first, but one day when she runs off to school she passes a house. There she finds a guy from school living. He doesn't care for girls at all and pushes people away a lot. But when he finds out where she is living, and after a landslide that destorys her tent, she starts to live with him and his brother...

She soon finds out the reason why they both keep away from girls... It's not becuase they are gays, no [img]i/expressions/face-icon-small-tongue.gif[/img] It's becuase when they get hugged by a girl they turn into their year of zodiac animal...

No ecchi, no action, small fighting but only for fun and lots and lots of humour.

Edit: Or why not Hikaru No Go (altough that is way to deep to understand at such an age if he isn't a mastermind), he could enjoy Sai, he is funny as hell.