OK, so I don't really understand how this happened, but Zettai Karen Children has become, hands down, my favorite, ongoing, long-running manga. Seriously, I don't understand how ZKC does it. I remember when I first started this back when it only had 40 or so chapters scanlated and reading it only because I had nothing else to do. Then, somehow, it got better and better until it finally reached the threshold of "excellent" and then managed to stay there for 300 chapters. How did that happen?
Don't be fooled by the seemingly ridiculous premise. ZKC is a comedy, but it is also very character and plot-focused. Plot-related details mentioned in the first few volumes are still mentioned even now, 300+ chapters in. While it might not seem like it at first, Shiina Takashi really knows where he's going with the storyline, and while it is certainly slow-paced, he also somehow manages to make even the fillers interesting and worth reading.
The characters are also really incredible because they age in real-time. (Yes, no time skips!) And there are simply so many characters that it's amazing that the mangaka can keep track of them all. But, he does, and despite the crazy character count, I even remember all of them. ZKC is really one of those stories in which there is no "one-off" character. All characters reoccur. And it's really interesting to see Shiina Takashi use all of them to his advantage.
So, in short, ZKC is difficult to start at the beginning, but once it passes a certain point, it becomes an absolute joy to read every time a new chapter comes out. I don't really know whether this manga is for everyone, because I'm still in awe at how much I like it, but I do know it is worth trying out, even if it's not really the type of manga you usually read.