Nyan Cat is a boy. Tac Nayn is a girl. Based on the mobile game, when Tac Nayn drinks the nrg drink, she gets a bow. Now this could be wrong; Tac Nayn could be.... Jack, tu can editar this out, right? Assuming Nyan Cat Don't get no bow, I rest my case
Nyan cat is a boy, and Tac Nayn is a girl, proven por Nyan Cat lost in Space, a Nyan cat app, where tu can play as Tac Nayn. When tu get the Adrenaline power up for Tac Nayn, (Adrenaynline) their eyes go Kawaii and a rosado, rosa bow appears on their head. This inspired me to make a custom called "true Nayn" which has eyelashes, a bow, and a curious expression on 'her' face.
Nyan Cat is based off of Chris Torres', (his creator), cat Marty, therefore he is male. On twitter Nyan Cat has also been referred to with he/him pronouns. Tac Nayn is a male, as confirmed in the descripción of his original video.