Eugene Rantz shows up as a secondary character in 86 -Eighty Six-, making his first appearance in Run Through the Battlefront. He's a second lieutenant serving in the 177th Armored Division under the Federal Republic of Giad.
Eugene comes from a fallen noble family—his parents were Alba nobility back when the Giadian Empire still stood. He joined the Federacy's military largely out of necessity, trying to support his younger sister Nina. Beyond just getting by, though, he's earned solid respect among his peers for his Feldreß piloting, which is basically his main skill set worth noting.
Content compiled by AnimeList.moe from publicly available sources.