Harvest Goddess
The Harrrrrvessssst Goddess. Originally appeared in Harvest Goer '07 and was a direct reference to the Harvest Goddess from the Harvest Moon series of games. With the help of the Pikmin, the Harvest Sprites, and later Chibi and Golem, she was attempting to turn Nothing into a beautiful country instead of the wasteland it had become. She was opposed by the Harvest Demon, and near the end of the OG engaged him in battle. She was shot and killed, but to ensure that there would still be a goddess, Death forced Luiigii's recently displaced soul to possess the body.
Luiigii continued to possess the body in Harvest Goers '07: Ready, Set, Grow! and, unlike the previous goddess, abused her power for her own pleasure. Acts of love could temporarily cause the former goddess's spirit to return, but usually pissed off Luiigii as well. Chibi attempted to feed Luiigii a Blue Mist Berry and return the goddess to her old self, but she refused. Death brought Mother Nature and Father Time to intervene, where they forgave Luiigii the circumstances and switched Farmer Jon's soul into the goddess instead, then immediately used the berry to purge him of it.
Amidst all of this, Jon revealed to Luiigii that he, as the Harvest Goddess, was his own mother (despite temporal inconsistency), a theme that started to get carried over to the third story in the series, Harvest Goers '08: Harvest Wasteland. Since that story didn't go anywhere, the idea was instead implanted into the canon timeline.