Vooren Grantz is a young male character distinguished by short medium blonde hair and emerald eyes. Within his original series, he serves loyally in the Imperial 203rd Aerial Mage Battalion under Tanya Degurechaff, holding ranks ranging from Second Lieutenant to First Lieutenant across different timelines and media. His standard equipment includes an Elinium Type 97 'Mobile Assault' Operation Orb, a rifle, and Empire flying gear. Adaptation portrayals vary. The light novel depicts him joining as a supplementary mage during training missions; he remains with the 203rd after distribution and avoids being shot down in Operation Revolving Door. In the anime, Tanya trains him personally, and he later participates in Attack Plan 177 where Anson Sue shoots him down, necessitating rescue from the sea. The manga presents him as an 18-year-old recruit sent directly to the Rhine Front; he ultimately joins the 203rd as a replacement after a night raid mission where his magical potential impresses Viktoriya Ivanovna Serebryakov. Key personal details include having a younger sister named Ursula and surviving an avalanche during physical training following Tanya's intervention. He harbors unreciprocated feelings for Viktoriya. Within the crossover series, he appears as a student. He volunteers to assist Darkness with her talent show act, unaware her intent was for him to whip her, resulting in class ridicule. Later, he is assigned to the intercom committee alongside Megumin.