Porky Minch is one of the main antagonists of the Mother/EarthBound series. In EarthBound, he was Ness's next-door neighbor, and at the end of Ness's quest to stop Giygas, he revealed himself to be Giygas' right-hand man. However, Giygas was defeated and Porky escaped through time and space, and he travelled throughout the universe to build the Pig Army. Eventually, his abuse of time travel rendered him immortal, albeit in a near-death state with pale skin and hair. He was eventually unable to travel to any more dimensions or universes and he, along with his private army, reached the Nowhere Islands. From that point on, he made it his ultimate goal to destroy the last remaining remnants of humanity living there by extracting the Seven Needles said to contain a Dark Dragon with the power to heal the world or send it into oblivion.
The ones who stopped the immortal Porky was Lucas, Kumatora, Duster and Lucas' dog Boney. They managed to damage his Bed Mecha enough so that it ran out of energy, causing Porky to retreat into the Absolutely Safe Capsule. However, what Porky didn't know is that once the capsule was sealed, it would never open again. Porky was trapped for eternity, unable to ever die becoming immortal.
In this game, Porky is freed from the Absolutely Safe Capsule and restored by Ness, Lucas, and (indirectly) Rosalina. To prove he deserves a second chance, he joins Ness and Mario to retrieve the Ahkoo Amulet from Bowser. He strongly loves and admires Rosalina, seeing her as a role model and big sister, and his admiration is what turns Princess Penelope back into Rosalina after she wears the amulet.
Porky appears as the World Boss of Earth World. He attacks in the same manner as he did in Earthbound, but a little bit more extreme attacks than before. While he doesn't give a Heart Crystal, or unlock a new world alone, he is needed to be defeated in order to unlock the Heart Crystal Portal to get access to Hero World. If the player defeats Porky, but does not have all seven crystals, the game ends here with the Bad Ending. However, the game doesn't save after this boss unless all seven crystals, making it possible to get the crystals without any repercussions. If the player has all seven crystals when they defeat Porky, the player is then able to access Hero World.