her time confined in a special chair, known as a "Manage Machine". Although she is a Dual Kind, she only is used as a Head Diver in emergency situations, due to her weak constitution. . - A Bio-medical Engineer who works for Mode Warp. She works closely with Akamatsu Industries in trying to understand and eliminate Algernon. She was recruited by the mysterious "Director" to take part in the Dive Inspection several years earlier, and thus is familiar with several of the antagonists in the series. She is killed shortly after learning that she, as a survivor of the Dive Inspection, is a carrier of Algernon. . - A 24-year-old Head Diver, who is usually partnered with Kaede. Although he often shows a collected personality in front of others, he suffers from psychological trauma from when his younger brother was killed in an accident while testing early Neuronoid models. Seeing Keita reminds him of his brother, causing him to break down on several occasions. He is a powerful hypnotist, and is able to hypnotize others merely by looking into their eyes. He is devoted to his partner Kaede, and after announcing her pregnancy, marries her before the final battle. He is tragically killed along with his new bride when she seemingly succumbs to Algernon and kills them both. . - Shou's partner, and a powerful psychic. Her dowsing abilities are a great asset in her role as a Head Diver. She has a past connection with Mammon and the Superhuman Federation, and much of the latter part of the series deals with their attempts to harness her powers. She marries Shou before the final battle, but seemingly contracts Algernon and kills both of them. Their unborn child somehow manages to survive and is rescued by one of the "lizard girls". . - Ri-chan is . - Yamajii is . - 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 and protect Hinoki,