Angel Aaltonen is a weaponsmith from Shiganshina District who earned the nickname "King of Inventions" for good reason—he's the guy who created the Three Dimensional Maneuver Gear, basically humanity's most important weapon against the Titans. Beyond that, he's also responsible for figuring out that Titans have a weak point at the nape of their necks, which kind of changed everything about how people fight them. His contributions to warfare tech have made him pretty legendary in the fight for survival.
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