Torain

Torain is the 5th son of Hiraku Machio and the 1st son of Oni-Maid Ann. It is said to be raised as Alfred's retainer.

Since Hiraku and Ann couldn't decide on a name, they consulted Gargard, Doosu, and Valgreif. After reducing the options to 1 per person, it was decided by lottery and the winner was the name chosen by the Demon King.