Gattenmeier has the appearance of a housekeeper, with a blue costume with an aquamarine gem, white apron, pink hair and earrings. She also has a ghost tail like many other Yo-kai, a hairdo like Whisper's, and the black strip between her eyes like Whisper and Verygoodsir. Occasionally, her eyes become red when she forces herself to do the requested chores.
Gattenmeier is nice most of the time, but when she is given certain tasks, she tends to be mean.
Gattenmeier will respond to any request, no matter how hard it'll be to fulfil. She never stops until the chore is done, and that can result her turning insane.
Like Verygoodsir, Gattenmeier has developed quite a bit of hatred towards Nate because of all the work she has had to suffer. After she took care of him, he was suddenly nice again as if the shift never happened.
Yo-kai Watch animation series
In EP138, Whisper catches the Yo-kai Flu again. Jibanyan decided to hire Gattenmeier, so she could take care of Nate for twenty-four hours. She did everything Nate requested, like cleaning his room, doing his homework and even force-feeding him pudding.
In the bathroom, Nate and Jibanyan talked about how scary Gattenmeier was. Nate explained that she can do anything she wants, even destroying the world. Gattenmeier overheard them, and decided to take control of a nearby missle base to destroy the planet. Failing to stop her, Nate decided to summon Venoct so that he could save the world, but the twenty-four hours were suddenly up, leaving Gatternmeier confused.
When Whisper came back from the doctor, he finds out about Gattenmeier and develops a liking to her. Nate and Jibanyan disagrees in fear.
"Gattenmeier" is a portmanteau of gatten (comprehension) and Rottenmeier.
Sharing similar origins with Verygoodsir, Gattenmeier is modeled after Fräulein Rottenmeier from Johanna Spyri's Heidi, the strict, dogmatic housekeeper of the Seseman household who constantly reins in Heidi's spontaneous behavior. Owing to the Japanese animated adaptation, she's about as much of an iconic character as Sebastian (Verygoodsir's Japanese name).