The way you put that you wish Touka and Kaneki never got together reminded me of Yaoi fangirls and shippers on Tumblr that made me cringe in disgust. To be honest, I was neutral about her in the first manga but her character development is incredible in :Re. She grows from an angsty teenager to such a mature and caring woman. She cared for the children of Goat. She saved a lot of people like Tsukiyama, Hinami, Ayato, etc. In the end, what important is Kaneki found happiness so why do you have to be so salty. He suffered a lot and never had a family so it is nice he is able to have a family of his own Ichika is such a sweet angel too.