I praise PBS for at least taking an effort to educate kids about AS, but I think the character is too quiet. I think Buster and D.W. seem more ASish than Carl does. Carl just seems quite shy. D.W.'s obsession with Mary Moo Cow and her snowball aren't normal anthro ardvark girl things. Perhaps if the eppisode consisted of D.W. being diagnosed with AS and then Arthur becoming more understanding of her and nicer to her I would be happy. Carl isn't in any other eppiosdes and is a forgetable character.
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I'm not weird, you're just too normal.