This enemy is the Red variant of Doge and Le'boin, with increased health and attack damage. It is slower than Le'boin and takes longer to attack and its attack range is slightly decreased, so you can safely use Dragon Cat against him.
6,000 damage (734 DPS)
380 (area attack)
228f 7.6 seconds
6f (11f backswing)
This enemy appears to be loosely based on Yama, a deity in East Asian and Buddhist mythology that is called Enma in Japan.
This is the only appearance of a Red Doge, which doesn't exist as a standalone unit.
The character on Lord Enma's headwear means "Emperor/King" in Chinese/Kanji dialect.