Mars is the fourth goddess to emerge in the series, inhabiting Yui's body. When she takes control, Yui's hair gets tied into a loose braid and she wears a ring-shaped headband. Unlike the other goddesses, Mars only recently woke up—specifically after Yui started dating Keima, who had agreed to cross-dress at the time. As a goddess of war, she's cautious by nature and constantly urges Yui to arm herself before heading into unknown situations. She's also somewhat thrown off by Yui and Keima's cross-dressing, initially mistaking them for a boy and girl respectively. Despite only just meeting Yui, Mars is fully supportive of her feelings for Keima. When she channels her powers, she can conjure a magical rapier.
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