Corporal, age 16. Squad 7 tank pilot. Daughter of the late Darcsen engineer, Professor Theimer, she was adopted into the Gunther family and Welkin's sister. Taking to engineering in her father's footsteps, she elected a mechanic's path in secondary military educations, earning several credentials before enlisting. The consistent prejudice she faced since childhood due to her Darcsen blood has fostered not bitterness, but respect for her. A natural tinkerer, her hobbies include collecting tools. The wrench set Welkin sent to celebrate her entrance to high school remains particularly dear to her. Though the operations cost her her life, Squad 7 survivors report Isara's actions up to and following the Marberry mission and a powerful boost to squad solidarity.