Momiji ga! Smart and evil. Also like non-human characters.
And nothing beats Momi-Titty combo.
I wonder, what is Momiji full name. There are several times, when it's mentioned (Hinjakubara?), but all seems to be fake. And character profiles of Momiji, Ichiko and Tsuwabuki are (as far as I know) untranslated.
P.S. BTW, shold have started pool for secondary characters (cause that nun-ish shinigami is so damn cute, literally), but too lazy duh... On second thought...