Itoi chose to use the pixelated style of "Mother 2" for the Game Boy Advance "Mother 3" because he was uninterested in computer graphics trends. The series' games were written in the hiragana alphabet instead of in kanji (Chinese characters) so as to remain accessible to young children. Itoi described the game world as governed by a "might equals right ... macho" power struggle. The antagonist, Porky, was designed as a "symbol of humankind", complementing Itoi's view of evil on a fungible morality spectrum with "pranks" and "crimes" at its extremes. Itoi compared the way in which the characters realize their psychic powers with menstruation and added that human physiology was "one of his themes". Players sweat when learning an ability based on Itoi's belief of how physical struggle facilitates growth. He also included characters like the Magypsies and Duster (who has a bad leg) to show the value of having friends with different qualities.