Morvay is a character from the game Nu: Carnival, voiced by Natsumeda Yuto.
Official description from the game’s website:

A familiar created by the Grand Sorcerer, Morvay is an incubus who sucks the "vitality" out of his victims to replenish his essence levels. He finds it hard to hide his true feelings, resulting in him regularly being teased by Aster. He spends most of his time flying around gathering intelligence, as well as searching for his next nutritious "meal".