Known in the Devildom for being Diavolo's close friend and right-hand man. The eldest of the 7 brothers and hence is the leader of the household, Lucifer presents himself as a calm, composed, and intimidating person. 

His brothers frequently comment on how scary Lucifer can be. He is a very strict and unforgiving demon and does not hesitate when doling out punishments to his younger brothers.

However, despite being so uptight, he still makes an effort to joke around with his brothers.