Onyx Sorbetstorm

"Onyx Sorberstorm here is a mad scientist pony from Equestria before he went to rebuild the New Group P365 after Dazzle Twister had died. It's worse than when Arianna Smith from Walkerville had to rebuild the Blot Monster to destroy all of Walkerville since the Last Day was over. I don't like the sound of that."

--Su Ji-Hoon, Pikadon's Wrath

Onyx Sorbetstorm is a mad Equestrian pony scientist who formerly served for Equestria that he will be the leader of New Group P365. And also he is the successor of Dazzle Twister and a major antagonist in post-Last Day of Equestria.

He is the pony survivor who survived from nuclear attack in Equestria even though his home has been destroyed and made his wife was deceased,so that's why he is one of former Equestrian pony scientists who were afraid of nuclear attack.

However, he blamed Twilight Sparkle and Princess Celestia or the Grand Alliance for creation of nuclear attacks that caused him restore the Group P365 with the help of former Equestrian pony scientists.

Therefore, he would be led the New Group P365 to help post-Last Day pony ghouls and made the creations of the types of zombies for defeat and kill Twilight Sparkle and Princess Celestia.