Quaetro Blitz emerges as a C-rank Regular during the 28th Floor test, failing initially before resurfacing in the Workshop Battle on the 30th Floor. Hailing from the Blitz Family—a lineage notorious for fiery prowess and explosive tempers—he mirrors his relative Quant Blitz’s maniacal, psychotic nature. His striking red hair and eyes complement a medium build, though his gender remains unspecified. He first crosses paths with Ja Wangnan on the 28th Floor, bizarrely mistaking him for “Chirpy,” a childhood pet he admits to burning. Their clash escalates into combat against Viole, where Quaetro displays superior flame control, conjuring three *baangs* to overwhelm most E-rank Wave Controllers. Viole’s retaliation with five *baangs* defeats him, yet he escapes unscathed. Mastery of the Hwayeomsa technique further amplifies his threat, enabling him to wound Viole and decimate foes during the Workshop Battle. Allying with Chang Blarode, Quaetro hunts Regulars and targets Team Tangsooyook until Khun Aguero Agnes temporarily entraps him. Later, in the Plug Game’s fifth round, he incinerates every opponent except flame-immune Yeon Yihwa, scornfully dismissing her fear-driven abilities as inferior to his refined control. His motivations gradually pivot from chaos to capricious camaraderie. During the Development Tournament, he aids Wangnan in summoning Viole, citing a growing fondness for Wangnan over loyalty to FUG. He later assists in missions against Team Snake, torching enemies while allowing Wangnan to advance, and joins hostage rescues before boarding the suspendiship. The Hell Train saga sees him and Chang challenge Ha Jinsung to aid Team Tangsooyook’s escape—a futile effort ending in swift defeat. Confined aboard the train, he passes time with Chang through card games. By the Nest battle arc, he stands among Regulars heeding Khun’s strategies. Quaetro’s trajectory shifts from fiery antagonist to an unpredictable, occasionally cooperative force, guided by personal whims rather than allegiance. His volatile flames, familial legacy, and mercurial alliances cement his role as a perilous yet dynamic entity within the Tower’s ever-shifting hierarchy.