Blue Delmo S (青デルモＳ Aoderumo S) is a Blue Delmo member.
Blue Delmo S has short black hair. She is always seen in her Blue Delmo uniform.
During events of Trial 4, she was part of the Blue Delmo group which captured Maypia Alexymetalia and Gozo Aida during their attempt to infiltrate Hagen's ship. She was knocked down when Maypia and Gozo escaped from them.
During the events of Silver Wild Grapevine, she was part of the Blue Delmo squad which barricaded themselves in a corridor in order to stop Aika from pushing deeper into the base, towards the Delmo Commander's office. There she is seen sitting with one knee drawn up and holding her rifle, as part of the 4 girls who form the initial line of defense.
However, she and her comrades were unable to hold Aika, as Aika during her charge shots Blue Delmo U (do not confuse with Blue Delmo Leader), Blue Delmo W and other Blue Delmo standing in back line with her stun gun, rendering them unconscious. After that she knocks down Blue Delmo T by falling on top of her back and disables Blue Delmo S and Blue Delmo B with precise blows to their necks, using both her hands. Finally, Aika hastily disables Blue Delmo C by landing a devastating hit to the helpless girl's neck with none other than her foot, sending her gasping as she arches her back and lifts her butt. In the result all 4 girls who were standing in front line simultaneously crumble as they fall unconscious.