The line comes from The Eminence in Shadow, the anime adaptation of Daisuke Aizawa's light novels that premiered in 2022. Its protagonist, Cid Kagenou, leads a secret organization under the alias Shadow, and his deadpan chuunibyou declarations became instant meme material. 'Waga na wa shadou,' meaning 'my name is Shadow,' is one of the most quoted of them, spreading through anime edits, AMVs and TikTok transitions. Like other dramatic anime voice lines such as Za Warudo, it endures because it instantly makes any reveal feel powerful.