Loqi Tummelt is a minor antagonist in Final Fantasy XV. He is the main antagonist in Final Fantasy XV: Assassin's Festival, a free DLC event. He is a Brigadier General for Niflheim and commands a unique magitek armor.
Loqi has blond hair and wears the same black and red imperial general's armor as Caligo Ulldor, albeit with the red and gold banner with his crest over the other shoulder, likely due to his left-handedness.
Loqi holds grudges, which fuel his motivations to work for the Niflheim Empire. He hates Cor Leonis, a Lucian marshal, whom he has encountered before. After losing to Prince Noctis, he begins to begrudge him as well, and seeks to hunt him down. Loqi seems convinced the empire is a force for good in the world and that Noctis is responsible for the strife Niflheim and Lucis are embedded in.
Loqi confronts Noctis Lucis Caelum and Cor Leonis when the two investigate imperial activities in the Duscae region. Intent on killing Cor, the Brigadier General battles them from inside a large suit of magitek armor. Loqi is defeated, and Noctis continues on his journey. Though his magitek armor was destroyed, several reserve units are kept in storage for Loqi to replace it.
Loqi heads to Lestallum during the Assassin's Festival to catch Noctis. Loqi and the magitek troopers he commands take over the town and imprison Holly Teulle, the head engineer of the EXINERIS power plant. The plan is to lure Noctis out, and they deploy the Wallbreaker Wave to cut Noctis from the power of kings, believing it would render him harmless. Cindy Aurum asks Noctis and his friends to free Holly, and they ambush Loqi and defeat his magitek armor yet again while Cindy dismantles the device that projects the Wallbreaker Wave.
Loqi, in his magitek armor, is fought as a boss in both the main game and in the Assassin's Festival DLC event.