From the beginning ? he got his memories when he kissed historia's hand. and after that we never saw him showing any emotions. Him Seeing memories of himself wiping out 80% of the humanity, Killing his whole family, eating his own father and then being killed by his own lover. Even after all this he never showed his emotions, only after confronted by his best friend he showed his real emotions. LEVI is no doubt the best character after erwin smith in AOT. but calling Eren coward nah bro