Monita did not originate from fanon, and the information on this page may not be entirely accurate to their canon. You may read more about this subject in the context of their canon on the following wiki(s):
Monita is the female host and guide for the Wii U Game Nintendo Land. Her purpose is to help players out when starting the game and helping them get started. She also tells you how to play the attractions in the park. She joins in some of the games such as Luigi's Ghost Mansion where she helps out the Ghost Hunters if there are less than 4 of them, or in Takamaru's Ninja Castle where she gets kidnapped after telling you the rules of the game, and she later talks to the player telepathically on the second stage. In Pikmin Adventure and Metroid Blast, the player is introduced to Dark Monita. Dark Monita is the "Evil Overlord", and is essentially alike to Monita (but is a separate character, as both Monita and Dark Monita have been seen on screen at once), but the only difference in appearance from Monita is her Purple Jester Hat. She is sometimes seen in a typical looking "Evil Spaceship", dropping down enemies (Both from the Pikmin and Metroid universes, depending on the attraction game you are playing).
Monita is a robot. She wears a hat, and a bow. She has a big monitor with a simple face (it's mouth moves very little when speaking - this is the only movement her face makes). An arm pops out of the bottom of her monitor, with balls that allow it to move like a joint.
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In the NTSC version of Nintendo Land, she speaks with an American accent, while in the game's PAL version (Including the Australia version), she speaks with a British accent. In versions of the game released where English is not the main language, she speaks with that region's main language.
Monita closely looks like an information sign in front of the attraction. they both have a ribbon and a square panel, but Monita has brighter colors like blue and red and white, and the signs are just wooden. You can also compare them by thinking Monita doesnt have a full arm just like when you open the first "?" box.
On some of the loading screens, Monita is seen without her hat drinking coffee. This is a reference to the Wii U's codename, Project Café.