Mamemametchi's appearance is similar to Mametchi. He has starry eyes, yellow skin, a large lower body, and long arms. He also has a large orange mame "cap" that covers the top of his eyes. When surprised, his eyes pop out of his cap.
Since Mamemametchi was born in ancient Tamagotchi times, his is smaller and shorter than a normal adult Tamagotchi of the present. He is about 2/3 the size of Mametchi, and is about the same size as Chamametchi (Mametchi's little sister), even though Mamemametchi is an adult Tamagotchi character.
Mamemametchi first appeared in episode 27. The planet is covered in jungle, and the reason is that Mamemametchi tried improving the Mame Fruit Trees but accidentally caused them to grow out of control. Mamemametchi blames himself and won't forgive himself until he can restore Tamagotchi Planet back to normal, and so he creates a new invention called the beam launcher that will reduce the overgrown trees. Thanks to electric power from Telelin, he is successful, and the ancient Gotchi King allows him to start his own laboratory.
He later appeared in episode 141 through a flashback, when Mametchi and his friends discover the remains of the beam launcher he invented in ancient times.
Mamemametchi is from the ancient times of Tamagotchi Planet. Mametchi, Memetchi, Kuchipatchi, Lovelitchi and Telelin meet him when they traveled back in time, forced by the Kuchipatchi of Truth. He is poor but very loyal, polite and brave. However, he gets upset because he feels guilty about accidentally covering Tamagotchi Planet in trees.