|December the Cold|
|Release Date||Nov 21, 2012|
- "Nice to meet you, I am May... I'm sorry, I don't do handshakes. I might accidentally freeze you if we do handshakes, that's why. I apologize for not being able to do so"
- — December the Cold
A witch who was reconstructed in the lab. She is operating on her memory of her sworn loyalty to Maquina. The control system of her magic power is still unstable, so anyone who touches her will be frozen
- April the Sunny is a clone of December the Cold. (referred to as "May the witch" in April's description; December also refers to herself as May in her voice)
- April the Sunny and December the Cold are complete opposites of each other, excluding their eye and clothing colors. Their ATK and DEF stats are swapped, as well as their skills (April the Sunny: ATK x1.5 / December the Cold: DEF x1.5); April the Sunny is able to control her magic whereas the powers of December the Cold are unstable.
- According to A.I. Sisters December & April's voice, this is to compensate each others' weakness.
|Voice actor (J)||何直美|
|Voice actor (E)||Nan Naomi|