I forgot the significance of Kaneki using ‘anata’ to address someone. Could you please tell me why its so important?

the-one-eyed-goat:

This post briefly mentions it.

TL;DR the use of anata is significant because it’s informal and depending on context can be pretty personal. For reference, other than meaning you, it can also be used as honey, dear, darling, my love, etc. and is usually used by married couples.