There really is a "good" way and a "bad" way to write 20 Things fics. There were stories written by excellent writers in which the pieces in themselves were excellent to read, there were stories where the characters were extremely well characterized such that I was almost open-mouthed at the level of understanding, but that didn't flow as a 20 Things fic, and it was sad, really. And there were really poorly written ones with typos and poor characterization and uninteresting styles, but that flowed as 20 Things fics, and somehow, it works better. I mean, it's all a matter of opinion, of course, but in this very specific way of writing, there are some general rules that I, personally, think apply.
I also feel bad for people who wrote for a popular character and there are multiples. Tezuka had like six, none of which I bothered to read. Mizuki had two, both of which had high points, but I think I get won over by gayness too easily. The less gay of the two was, in my personally opinion, the better written story. There was only one for Eiji, which was well written but included Eiji having sex with a girl, which left a rather strange aftertaste, and one for Golden Pair for which the first line was something along the lines of "Golden Pair aren't actually dating." Oishi had one okay one, but I don't think anyone did them justice.
...I'm going off on a tangent.
The point of this post is, I really want to write a 20 Things fic now. Thing is, I don't know who to write for. I'd love to do Mizuki, but I don't know how I could really get past being swayed by the two I read. Any input is welcome, but this is not my agreement to write one for any character anyone suggests, because the nature of a 20 Things fic is to be introspective, and if I don't get them, I'm not going to stumble around in the dark and make a fool out of myself.
... I'm really hungry.