Mars~Chan is the personified anime version of Mars. She likes memes and Earth~Chan is jealous of her because Nasa~Kun seems to be more interested in Mars~Chan than her. Nasa~Kun even gave her the mars rover, which is now her pet. She also really likes tech but doesn't like being called a nerd. Mars~Chan is smart and more clever than some of the other planets. She is also anxious at times.