Nikki

Nikki's first and major appearance is in the 3DS application, Swapnote. Here she would instruct players how to use the feature, and after that players can chose whether or not to receive notes from her in the future. If players selected Yes, Nikki would continue to send notes to the player giving them updates on upcoming Nintendo news, as well as simply sending notes wishing them a good day, or sending words of encouragement. Source: Nintendo Wiki