Yeah, things of such innocence that they are entirely lacking in malicious intent.
Yanderes (badly written ones), tend to be sadists though. What very very specific thing I'm talking about is something that can do horrible things with absolutely no idea of what a horrible act it does. Like at the very core the "subject", knows no evil, is entirely pure and good.
I mean with something that enjoys killing and maiming... its an easy thing to fathom and subsequently kill. No fear from me, just justice.