Why name her Shinigami?

[neatoman]

I didn't really think about it before but why was the name Shinigami chosen for Karai's old buddy? Her appearence is based on a stereotypical witch, rather than any well known death personification. And obviously she never kills anyone in the show.

So why did they name her Shinigami? Did they simply think having a character essentially named Grim Reaper was cool, and never put more thought into it than that?