Mary Lou Wentz has a bit of a perky personality. Mary also has a kind personality as when she stood up for Teddy when she lost "Betsy" or that fishing pole in that ice hole. It is unknown whether she has a perky personality or a dull personality since the first time she met Teddy all she could talk about was knitting and was not fond of the pop music Teddy turned on which showed she had a dull personality. But when Amy showed her how to text she showed she had a perky personality.