Think it was trollfic; then again, it's entirely likely that someone was just that daft. O_o Anyway; on with the Sue classification!
Even worse to encounter than all the other Sues listed; for the simple reason that Boring!Sue is, well, boring. She doesn't have anything interesting about her at all, her profile will just contain the bare bones; ie, name, age and a power description. She will have hardly any personality; what she does have is dull. However, all canon characters will instantly fall in love with Boring!Sue despite all this, which is what pinpoints her Sueishness.
Fairy, angel and centaur in one... or maybe even more, this Sue is not content with merely being one fantasy type. No, she has to be a mixture of several fantasy types; ignoring all restrictions which would make such a composite impossible. Composite!Sue will have all of the perks of such a union and none of the problems.
Dragon!Sue can go two ways. Either she's a Villain!Sue, but with dragon powers tacked on, or she's a Purity!Sue, of course, with dragon powers tacked on. The second is particularly irritating when she pops up in LOTR fanfic, as it shows that her creator Did Not Do The Research. The first can be annoying when said Sue is completely indestructable, especially in fandoms where dragons can in fact be killed. Oh yeah, and Dragon!Sue NEVER has an all dragon look. She always is a beautiful girl with dragon parts added on, or a dragon shape she can take voluntarily.
In her creator's eyes, Grrrl!Sue is the original feminist. In everyone else's eyes, she's a pain in the neck misandrist who spends her time endlessly belittling the men in the story and kicking any man who dares criticise her in the balls. Grrrl!Sue rarely has a male love interest, she normally has a female one. If she does, then he will be an Uke!Stu, whether he's written that way or not, and will meekly defer to Grrrl!Sue.