* At the end of Cornell's run, Exoristos is manipulated into bringing the Heart of Darkness out of Hell, and is beating herself up for being so weak-willed. Ystin calmly takes the evil thing out of her hands, tells her that it's a forgivable mistake, and offers to let her come with them on their quest for the Grail.
* In general, the relationship between Ystin and Exoristos. It never felt overly sexualised or played for comedy or anything of the sort: it was just a very genuine, very sweet romance between the characters, something that, even nowadays, is a rarity among comic-couples.