Hasegawara Ryuusei (ハセガワラ龍聖 Hasegawara Ryuusei) or Hasegawara is a cow who is determined to marry Janua. It later died and reincarnated into a human named Seia Ryuusei.
Hasegawara is a small brown cow that wears a top hat with monocle, socks and a red bow tie.
After it reincarnated, it took form of a slim young man with black hair and eyes with white rings inside of them, similar to Diabolos. His outfit consisted of a black off-the-shoulder shirt and boots.