Second Lieutenant Ruto Burney is a key character in the series 'Miritari!'. She is a military officer sent from the principality of Krakozhia to protect and assist the main character, Souhei Yano, amidst a comedic war setting. Ruto is known for her serious demeanor and professional attitude, contrasting with the other more eccentric characters. Her role is pivotal as she often finds herself balancing her duties with the chaos around her, bringing a sense of order and discipline to the otherwise humorous plot.