Rika (りか) is a Black Delmo member.
Rika has short light brown hair. Alongside her Black Delmo uniform, she is seen in casual clothes including red sleeveless button blouse, black long button skirt and white heeled shoes.
Rika was among the group of Black Delmo which attacked Aika and Gust in the underground parking lot, led by the Black Delmo Leader. She tried to inmobilize Aika by grabbing her from the back, looking to allow the rest of the Delmos to attack the salvager freely, but the careless girl forgot her enemy was armed with an electric baton. In a swift movement, Aika took advantage of Rika's distraction and swiflty positioned the weapon against her head. Busy in her struggle with Aika, and with both hands occupied, the defenseless girl had barely time to realize what was happening before Aika gave her an electric discharge which sent her screaming in anguish. Rika then lost her grip on Aika, releasing her, and fell back, clearly dazzled and confused, still holding her face in shock. She remains like this until Aika takes her out of her stupor by throwing a shrieking Naomi at her. The impact sends both girls crashing down to the floor, where they are left sprawled on the ground out cold, Rika lying on her side and Naomi face up, her legs wide spread. Curiously though, when we next see Rika, as Neena Hagen dissapointedly reviews her beaten soldiers, she is in a different position. She now lies flat on her chest, legs wide spread and cheeks blushed furiously, with a slightly open mouth.
Afterwards, Rika reappears during the unsuccessful attempt by the Delmo Corps to eliminate Aika during her vacation at Peroronka Island. She is seen drinking coffee at one table with Eri and Misaki and the hotel's restaurant, discreetly observing Aika and "Pierre Valimore" sitting at another table nearby.
After some time she is seen again as part of a Delmo group, this time led by Bianca, which confronts Aika in her hotel room, revealing their true identity. However, Aika manages to escape from them by jumping down from her room's balcony, freeing Rion Aida and Shuntaro Michikusa in the process, so Bianca's group begins a pursuit. After some running, Aika and her friends are forced to fight the Delmo in the hotel's kitchen, making quick work of all of their pursuers. Once the fight is over, Aika, Rion and Shuntaro take an elevator to the top floor in an attemp to find safety. However, when the elevator door opens, they encounter Valerie waiting for them. After a brief exchange of words, Aika knocks down the Blue Delmo, just as Bianca arrives in another elevator, escorted by Kana and Rika. Upon seeing Valerie's unconscious body on the floor and detecting the presence of the salvager, Bianca orders both girls to charge the enemy. With a swift move, Aika kneels down and retrieves Valerie's gun before the Delmos are even close. A confident Rika, seeing Aika has her back to her, hastily moves to strike first. However just as she is approaching the salvager, Aika makes a fast turn and lands a devastating elbow hit to the poor girl's jaw which freezes her in the spot. She then follows up with a direct blow to Kana's neck with Valerie's gun, which sends the shocked girl crashing down to the floor. Thus, she leaves both Delmos easily out of comission.