Mechibura

Personality
being a cruel and ruthless beyond belief even frieza was shocked on the amount of brutality he had towards anyone who stood in his way and being the oldest demon realm king from Dabura's knowledge

Backstory
The demon that caused the demon realm to separate by losing a century long war with the kai of time chorona  that loss and in his anger in the mistake of Boola killed him with no effort without the knowledge of his kids Towa and Dabura and were taught great power by their grandfather who was at the time planning a mission with Demigra and after the training and the mission with a young Demigra he died due to injuries and was later revived by his grandchildren who were granted a bit of his demon god power for their support of mission

Power
Being one of the most powerful being in existence and having a fight with high tiers gods like zeno was a norm and gods of destruction not even posing a thread to a great demon god like him