Monster Princess
 

Kaibutsu Oujo is a story about a princess among monster society, who is somehow without guards. A young boy and her sister were supposed to work as servants in her mansion, but the young boy was killed unknowingly saving his master before he got there. The princess restored his life, and now he must serve her eternally. Also helping out is the android Furandere.
This series has combat, comedy, and is deliciously twisted.

How's the character design?