He's the opposite of Nyan Cat. He's also emo and wants to eliminate Nyan Cat (he's evil too, so keep that in mind-)

You appear in space again but everything was all red..and destroyed, you wondered who could've done this..suddenly, you see Tac Nayn, Nyan Cat's archenemy, he basically thought that you were Nyan Cat..

Tac Nayn: "It's time I destroy you, Nyan Cat!"