On the Federation side, we have Ensign Io Fleming. On the surface, he is a privileged son of a rich family from the colonies. But beneath the confident smirk lies a reckless adrenaline junkie. Io flies the Full Armor Gundam (FA-78) not to save humanity, but because the chaos of battle is the only time he feels alive.

December Sky is a compilation movie that brings together the four episodes of the first season of Mobile Suit Gundam Thunderbolt . It is set during the climax of the original timeline (the One Year War), focusing on a brutal conflict within the Thunderbolt Sector .

The film excels by refusing to paint either side as purely good or evil. Instead, it focuses on two flawed, deeply traumatized pilots locked in a deadly rivalry. Io Fleming (Earth Federation)

Conversely, Daryl Lorenz is a sniper for the Zeon "Living Dead Division," a unit composed entirely of amputee veterans. Daryl, who lost his lower legs earlier in the war, finds solace in melancholic oldies and pop music. He is quiet, deeply loyal to his comrades, and fiercely patriotic.