Satan is one of adam arclight's elight four. He has tracked down Adam Blade for his boss Adam Arclight but refuses to give up adam blade's location.
Saten was originally Kyouji Kannazuki, an assistant of Doctor Gido who barely survived the Adam Project lab's destruction. Found by the Triple Six Committee, they infused him with an Eden Seed and Byakugou to turn him into an Adam like Needless to serve their agenda should Arclight turn on them. After years of disguising his identity and true power from Arclight and his associates, the Triple Six Committee finally decided that he should usurp Arclight as the new leader of Simeon.
Mysterious and always with his own agenda Saten has followed Arclight longer than any other. While he follows Arclight he often holds back information about Blade and the others. During his fight with Eve he curiously helps Eve save Cruz by pretending defeat. When Eve ask's why Saten claims its because he's in love with her.
Saten intentionally allowed Blade to become stronger so that he could fight Arclight, and Saten could clean up afterwards. He also realized that Eve's Doppelganger Fragment could allow him to survive without the Triple Six Committee, so he killed them off before getting involved with Arclight and Blade's battle.
He used his many Fragments to destroy Arclight's artificial heart and most of his body. Afterword going by his original name Kyouji Kannazuki, Saten reveals his intent to take over the world and make Eve the mother of his children. However, Riru's sacrifice revives Arclight, and he manages to memorize all of Saten's abilities while using the Simeon's towers to convert his body into energy to avoid Reverse Rejection. Saten's final action is returning Eve to the Blade group.
His Fragment is Thermal Energy Conversion; "Dai Yon Haddou (The Fourth Wave)" allows him to absorb thermal energy and redirect it in various ways.