Source http://kurobine.sakura.ne.jp/
Twitter https://twitter.com/k_cross
Sorted according to the site number sort (http://kurobine.sakura.ne.jp/mgesort_no.htm)

Update: 2018/11/28 added #299009 greenworm, #299010 papillon, #299011 bunyip, #299012 owl mage, #299013 tsurara onna, #299014 genie
Update: 2018/08/16 added #299008 highorc, #299009 greenworm, #299010 papillon, #299011 bunyip
Update: 2017/12/24 added #299007 night gaunts
Update: 2017/10/09 added #182 kamitachi, #29906 tritonia
Update: 2017/10/21 added #025 lamia

Sea slime... also known as a Jellyfish, but sure.

Base +3, tobeunforgiven2 +16

The list just keeps growing.

Base +14, redmanticore +6, tobeunforgiven2 +16

Wait... Female Ninjas are considered monsters now?

Base +6, tobeunforgiven2 +16, wenx° +2, racer0522 +3, FlowerSlaughter +7

This is proof Japan cracked the secret to awesome women. Apparently all one needs to do is increase the bust size, change the ears, and add a tail, and you have waifu gold. And we're all happier for it.

Base +3, blackforest25 +1, eldbetha +1

@Meachi
Lore reason: When the new Maou took over some human ninja ladies got turned into succubi. As they're succubi now, the encylopedist saw fit to include them.
Flavor reason: As females who kill men utilizing sexuality, and with an entire continent based on Japan already established and in need of fleshing out, adding kunoichi to the setting as monsters couldn't make more sense.
Real reason: Sexy ninja lady make penis hard

Base +7, repeatedmeme +9, FlowerSlaughter +7