The Betterman who the series in named for. Lamia often shows up when the human protagonists are in danger, transforming into one of his fighting forms to save them. He seems especially intent on saving Hinoki, whose brother he bears more than a passing resemblance to. It is later explained that by eating the Vivele Fruit that grew from Hinoki's brother, he inherited his memories, as well as some of his physical attributes. His ultimate goal is to defeat Kankel, the enemy to all life on earth.

[taken from Wikipedia]