I hate the "modern" tsundere. What I mean by that are characters that alternate between tsun and dere. Examples of that would be Taiga. I do like classic Tsundere where there is a progression from mostly tsun to mostly dere. Kurisu is a good example of that even though I don't like her very much. I wish there were more Tsundere with a more extreme tsun aspect and a real reason to be tsun, like belonging to a faction that's hostile to that of the protagonist or something like that. And then, over time, the girl becomes more dere as she gets to know the protagonist. That'd be great.