Tragic backstory doesn’t give a character a shield to be piece of shit, sadly, and so far I haven’t seen even one redeeming quality of his. At this point for me in order to like Katan he has to undergo a redemption arc on the level of Kuzco or Luke von Fabre and Im really not sure i will have patience to stick around to find out if he is going to undergo it at all.
I really don't know how or why I should be invested in a growth of a character who needs unknown amount of time only to become *bearable* (and the fact that a vn that was in development since forever still haven't gotten very far is its own separate can of worms). I will just go and read better stories with characters I actually want to root for instead.