darth_ender said:

I feel flattered to be included, though it's my first departure from an Ender-based avatar. I'm interested in knowing your reasoning for the assignments, DKO. Some seem obvious, but I'm curious about others. Nice theme!

Most are based on the username or the user's current or previous avatar, a few were chosen based on something about themselves they have shared (probably in Off Topic). There are quite a few with no real reasoning as I started to run out of villains.

I was having trouble deciding who should be the Creeper and the Black Knight, so I assigned those two based on Off Topic posting frequency. You two post fairly often in Off Topic, so you are basically billboards to advertise the theme :P Ender once called himself the "Dark Knight of Grammar" as well, thus the choice was made!