Nihilist!Tagg

Nihilist!Tagg, also known simply as The Nihilist is one of Tagg's aspects, and the most dangerous and evil of all. A manifestation of Tagg's inner pain, he was normally kept at bay by the numerous other aspects inhabiting Tagg's mindscape.

Orange Islands

However, during the J-Team's time in the Orange Islands, Swindle decided to steal Cynical!Tagg after overhearing Tagg complain about him to DS.

Taking this opportunity to be free, Nihilist!Tagg hijacked Tagg's body in short order on October 15th, and then mind-controlled Muddy, Doc, Crochet, Thresher, Sentinel, Limna, Draca, Hydreigon, and Helios, as well as Cobalt offscreen. Victini, being a legendary, was able to resist Nihilist!Tagg's control, leading him to seal him inside his GS Ball. Xatu managed to resist just long enough to teleport them away from the hotel, preventing Nihilist!Tagg from going on a murder spree immediately.

Luke, Tracer, and DS along with their mons confronted him there, after he had Doc, Sentinel, and Xatu use Telekinesis to bash the three trainers against trees and each other. The battle was a hard fought one, with Nihilist!Tagg using his mind-controlled mons to put Vlad, Lardna, Iggy, and Teal in the ICU, as well as Xatu teleporting in Coulomb to fight at one point, the Eelektross mauling and burning Guardé and Chord into the ICU as well. Eventually, Diesel was able to put Tagg to sleep and Swindle returned Cynical!Tagg, allowing the combined aspects to defeat Nihilist!Tagg and placing him behind a stronger seal.

Nihilist Soul

Following the reveal of Crewe's true species, the empathetic backlash from everyone managed to weaken Nihilist!Tagg's seal. While the J-Team was attempting to find their way through the various mindscapes, Noir managed to escape Fool's mindscape and made a deal with Nihilist!Tagg, the aspect powering him up into Nihilist Soul.

Upon meeting the J-Team once again, he gloated about what he did the first time, before attacking them alongside Noir. Summoning Tagg's immense pop culture knowledge, he transformed first into The Hunter of the Dark and then No Heart. In his final form, he froze time to critically damage the trainers, but was thwarted by the combined efforts of Silver!Tagg and the giant Archen from Tracer's mindscape, Pentigan using a Black Soul Gem to seal him within.

Infinity Keystone

Nihilist!Tagg made a brief appearance inside his Soul Gem, lamenting the fact that Noir was going with one of Pentigan's aspects.