Hydra  

In Japanese, Haidora is Valkyrie's younger sister who pursued her to Earth. She was determined not to take on Valkyrie's role at the wedding, so she crash-landed on Akinas temple and had her powers sealed by Akina, resulting in her becoming a child like Valkyrie. However, unlike Valkyrie, Hydra possesses an adult mind while retaining the body of a child. She can be released from her seal with a kiss, just as Valkyrie can be restored with one. Despite having a short temper and acting impulsively, she is capable of transforming into a winged pink and yellow horse and possesses other powers. Hydra enjoys practicing kendo while living with Akina and often teases Akinas about her breast size and feelings for Kazuto. When their friendship breaks down, they can combine to form Akidra.