Responses
I think he hates zanka because he veiws zanka as weak compared to him but his sister still thinks of him in a positive light, basically he's jealous
I think he is also a tsundere because as soon as he realizes it was going after Zanka he sprinted to him
So it seems Goka's jealous of Zanka coz of his abilities, but still cares for him as a brother. Or he's a tsundere? Or he's just doing that coz he was instructed by their elder sister?