If your definition is “follower of Christ”, sure, you can argue that Christ can’t follow himself. My definition is “follower of Christ’s teachings”, and he could definitely follow his own teachings.

So, speaking extra pedantically, Christ taught that he is the lord, and to believe in him and accept him as lord is to be a Christian. He believed he was lord, and he believed in himself and accepted himself as lord, therefore I think Christ would also agree that he was a Christian.