Who created the game mechanics that were later used by the "Mother" series of video games?
Mother (series):  Written by Shigesato Itoi and published by Nintendo, and featuring game mechanics modeled on the "Dragon Quest" series, the "Mother" series is known for its sense of humor, originality, and parody. Dragon Quest: Dragon Quest, published as Dragon Warrior in North America until 2005, is a series of console role-playing video games created by Yuji Horii and his studio Armor Project.
Yuji Horii