Shin

He was summoned as a commoner into this world in a Hero summoning experiment at Rumooku Kingdom incited by Weasel Empire's engineers. (16-7).

The only natural born demon lord left at the time of Shin's transformation was the goblin demon lord, so he was most likely Shin's father.

SkillS

 * [Composite Magic] (13-32)
 * [Magic Knowledge] (13-32)
 * [Magic Resistance: Composite] (13-32)