roboko (doraemon)

A character from Doraemon. She is a "Rental Friend Robot" that Doraemon brought from the future to comfort Nobi Nobita.

While she seems friendly at the first glance, she is very obsessive of Nobita (arguably borderlining yandere) to the point that Doraemon was forced to sent her back after she attack Nobita's mom for "stealing" him from her.