- Live-action movies
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|I just want to go home and farm.|
|— Sannagi on his family|
Sannagi was a young man with short black hair and thick eyebrows. He had a stocky build, and wears the standard Scout Regiment uniform within the films. His weapon of choice was an ax that he used to slash through a Titan's heels, putting them off-balance and bringing them down for the kill.
He was a mild-mannered, good at heart person who cared about his companions at the Scout Regiment and was capable of risking his own life in order to help his peers. He cared very much for his siblings, expressing a desire to go home and farm. While he had omni-directional gear, he often used an ax in battle to slice a Titan's Achilles tendon.
After the fall of the outer wall, the resulting loss of land results in massive food shortages. In order to earn money for his family so that they will not starve, Sannagi joins the military.
On the night of the military's departure to reseal the outer wall, Sannagi bids his family goodbye, comforting his siblings and assuring them that he will return soon. One of his sisters, Koyuki, gives him a doll, and he happily accepts it, tying it to his ax as a reminder to return home.
Later, while the recruits are eating in the mess hall, Jean and Eren get into a heated argument. As they prepare to start physically attacking each other, Sannagi steps in, picking up Eren and carrying him out of the hall. As Eren violently protests, Sannagi laughs at how the two are always fighting.
As the soldiers prepare to depart for Omotemachi, Sannagi excitedly talks to Eren and Armin about their prospects of finally getting to return home. Neither of them are particularly excited to return to the town where they lost all of their loved ones, and the conversation shifts to their prospects of meeting the Goddess of Shikishima's team, a soldier rumored to have killed at least ten Titans in half a year.
As the soldiers are travelling to Omotemachi, Yunohira stops the convoy after he hears noise nearby and orders the soldiers to help him investigate. The soldiers only find cattle nearby, but Eren and Hiana accidentally attract a nearby horde of Titans. The convoy leaves without the recruits, and they are forced to flee to Omotemachi on foot. Along the way, Sannagi saves Armin's life when he is attacked by a Titan. They manage to make it to the city where they are intercepted by a group of Titans, but are quickly saved by Captain Shikishima and his squad.
Eren and Jean get into another fight, ending with Eren knocking Jean out. After Souda treats Jean's wounds, Sannagi asks why he hates Eren and Jean jokes that its because Eren's face looks like he is carrying the weight of the world's misery on his shoulders. Sannagi defends Eren by saying that he lost his girlfriend, Mikasa, to the Titans.
When morning comes and the Titans rise, Sannagi goes to the front lines and fights them with his ax. He cuts out the tendons in their legs, knocking them over so the others can take them out. He helps defend Jean, who gets stuck on top of a building swarming with Titans. After they are lured away, Sasha and Sannagi take out a Titan, with Sasha blinding it with her arrows and Sannagi crippling it with his ax. When Armin is grabbed by a Titan, Sannagi tries to cripple it, but for some reason, his ax is not able to break its skin. Eren manages to rescue Armin, but is eaten in the process.
The survivors take refuge atop a nearby building, where Titans begin to surround them. As they begin to lose hope, Mysterious Titan appears and begins fighting off the remaining Titans. After it is finished, it collapses, and Souda orders the survivors to cut open its neck. They obey, and are shocked to find Eren inside.
After Eren is taken captive by the Military Police Regiment on suspicion of being a Titan, Sannagi tries to step forward in Eren's defense, but Jean tells him to stay for his own safety. When the White Titan appears and abducts Eren, killing numerous members of the Military Police and the Scout Regiment in the process, Sannagi and the recruits are left in awe at the sight of it. They are saved from the Titan only by the intervention of Mikasa, whose appearance miraculously causes the White Titan to cease his rampage and leave.
In the aftermath of the White Titan's rampage, as the recruits and Hans prepare for their trip to Monzen, Sannagi tries to convince a reluctant Jean to go with them, as they have a plan to seal the Wall.
As the recruits journey to Monzen to retrieve the inactive bomb on its outskirts, Sannagi asks Jean why he joined the Scouts. Jean says he did not want to, the only reason he joined was because his father forced him. Sannagi, amused, breaks out in laughter, playfully commenting on Jean's misfortune.
Arriving at the site of the crashed bomb, Sannagi helps load it onto the recruits' transport vehicle, and they continue toward the Wall in Monzen. However, they are stopped in the middle of town by Shikishima and his militia. He is thrilled to see Eren emerge from one of the militia's tanks, alive and well. However, his excitement is short-lived as he and the recruits learn that Shikishima plans to use their bomb to destroy the second Wall, and utilize the Titans to overthrow the Royal Government. As Eren attacks Shikishima in a fit of rage, Sannagi and the recruits watch as Shikishima repeatedly beats Eren. As they look on, Jean and Sannagi decide to try to rescue Eren from Shikishima.
Sannagi, observing a damaged building nearby, steps forward and tells Armin to go. Despite his misgivings, Armin agrees, and the recruits retreat with the bomb. Sannagi fires the anchors of his omni-directional mobility gear into the damaged building, and attempts to pull it over. Shikishima, amused, comments on Sannagi's strength, describing it as "the strength of a brute," before ordering his men to fire on Sannagi. As he dies, Sannagi gives salutes his retreating comrades as the damaged building topples over, landing on Shikishima's vehicles and causing an explosion that engulfs Shikishima, Sannagi, and his men.
The group gets away, driving in the vehicle. Armin holds Sannagi's doll from his little sister and cries over his death as Sasha tries to console him.
- Sannagi was one of the few movie characters exclusive to the movie that is not a replacement for any manga character, the other being Hiana. However, he could be a replacement Conny Springer, who had a desire to make his family proud of him and to return home.
- Sannagi and one other unnamed recruit were the only movie exclusive recruits to survive the events of the first movie. The other movie exclusive recruits, such as Fukushi, Lil, and Hiana, all perished.