Ok so the first season is all happy and everything. But there is violence often. In the second season it gets more deep and to be honest a lot of the messages are really not aimed at 8 or 9 year olds but at a slightly older age group right up to adults. Sex is implied, as well as the end of time and death etc. It's positive because it shows that it doesn't matter who you are.
What other families should know
Great role models
Too much violence
Too much sex