Callas

Callas (カラス, Karasu) is a character who appears in the Kamen Rider Battride War and also the main antagonist in the game.

Biography
Callas was Foundation X's scientist that named Susumu Karashima (辛島 進). However, he was trapped in a dimension of bird cage named Mnemosyne (ムネモシュネ, Munemoshune) with his former wife, Rie Kanai (叶井 梨絵). As he became a dark evil spirit entity called Callas, she instead becomes a light pure entity named Canaria with growing wings and tails. later, after his troops defeated by the Riders, Callas (as Decade Violent Emotion) battles Decade. Though their power is same, Decade is aided by Wizard and defeat Callas once and for all.

Portrayal
Callas is portrayed by Hōchū Ōtsuka (大塚 芳忠). Otsuka previously portrayed Deneb in the Kamen Rider Den-O.

Etymology
His current name, Callas is an anagram of his human name, Susumu Karashima with his name being rearranged Karashima Susumu.