クッキー

An egg-shaped robot invented by the Kuki Family and given to Kazuko from Hideo Kuki as a gift. 

Lives with the Kazama Family and can make popcorn, soda, and other foods and drinks appear from inside itself. Cookie now refers to Shouichi as his master (Kazuko as his former master), but still serves all the members of the Kazama Family. Cookie tends to favor especially Miyako, which is noticed by Yamato. This is because she diligently polishes him while he cleans their secret base. Despite being a robot, Cookie has emotions and can act accordingly to them. 

He has 108 transformations but only 4 of them are shown with number 1 being his main form to serve, his second being a combat military form that wields a sabre, and his third being a brain form which takes the the form of a small egg, and his fourth being of a beautiful teenage girl.

From url=http://en.wikipedia.org/wiki/Maji_de_Watashi_ni_Koishinasai!