Just like Ice said, morality is very rarely black/white, with most characters falling into some sort of lighter or darker grey. Going over the characters I've made (excluding the characterless, nameless Ryans) I've noticed most tend to be on the lighter "I'd rather help this guy even though he's not nice" side, some of my favorites are for example Nerites from Titans or Youssef from Outbreak.
However there are a few exceptions that delve into the darker side, and they tend to be my favorite characters. Sophia from Gunpowder is more violent and villainous than most of my other characters, but in comparison to other characters in the RP, she's fairly neutral. Jairo from AtDS on the other hand, is a character I'm trying to make as morally "black" as possible, with him enjoying death, torture and suffering all while having a purpose for it. Interested to see how that one goes ;)