Kobra

Now that Kotaru is able to stand and move around with ease, he is no longer the immobile, easy to hit and run away from target that he once was. Rai used to get a lot of cheap shots in on our little Ko and all Ko could do was take the abuse, keep smiling and keep idolizing his big brother. In the past week or so, however, Ko has begun to fight back.
More accurately, he has begun to strike back. If Rai gives him anything other than a loving hug or kiss, Ko is liable to get to his feet (quickly!) and then jettison himself towards his abuser, mouth open, teeth bared, ready to latch onto any pants, shirt or flesh that ends up in his jaws. And so, we present to you, Ko's latest nickname: Ko-bra for Ko is Rai's little 'bra' who strikes like a cobra.