You can request anyone and have any plot but I might not be willing to write it. Either I don't know the character that well to write an imagine about him / her or the plot is to hard to understand and I can't write it.
Fluff is available to write about but I'll need a plot to write about it first. So I don't want to see any comments writing just fluff, sorry.
If I don't want to do your request I probably won't reply to it.