I'm familiar with Highschool of the Dead with the manga but I became interested when the anime came out. I watched a few of it, but I'm starting to watch it as a whole when the English dub came. I don't mind about the uncensored stuff on its fanservice but its plot is interesting: a group of high school (and possible their parents) fighting zombies! Who would hate that?
And here are my favorite characters: Takashi is unsure of himself but he became a fighter and a great group leader. Some will hate Kohta being a fat nerd who loves guns but many love him being a gun-totting badass. Saeko is cool and a formidable sword-wielding babe in my eyes.
Overall, a great cast. And they were fit for one of my next drawfag request project on 4chan.