From Nookipedia, the Animal Crossing wiki
Lottie (タクミ, Takumi) is a special character who made her first appearance in Animal Crossing: Happy Home Designer. She was announced at Electronic Entertainment Expo 2015 and serves as a guide for players as they design homes. She is a pink river otter and Lyle's niece.
She appears later in Animal Crossing: New Leaf via an update, alongside amiibo compatibility and new villagers.  She gives the player a tutorial on how to arrange furniture with touch screen controls.
In Happy Home Designer
When visiting Lottie's RV at the campground, the bottom screen will display the following:
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