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|The one who will inherit it... is me.|
|— Falco to Reiner about the Armored Titan|
Falco is a short boy with a small build and little in the way of physical strength. He has light shaggy hair and big bright eyes that are also a light shade. Like his fellow warrior cadets, he wears the standard Marleyan soldier uniform consisting of a light jacket and pants, supply packs on the hip, suspender straps, a hard hat with a stripe around it, and tall combat boots. As an Eldian his uniform is different from that of the Marleyans in that the shirt collar has a small badge with the Eldian star instead of a small clip and the hat has a white stripe with the Eldian star on it instead of a pure black stripe. As is law in Marley, Falco also wears the Eldian armband as all his family and ancestors residing there do as well.
Falco is not made to be a man of war, and does not excel in the battlefield or at asserting himself. He finds himself wounded and delirious under enemy fire, only to be saved by his brother, and struggles to voice his concerns for his friend Gabi when she proposes a solo attack plan. However, Falco is not a coward. When Gabi is under fire he leaps from their hiding place to rush to her aide and protect her. While he is not an excelling soldier, he posses some margin of skill to have survived for 4 years in the Marleyan war.
Falco has proven to be a very merciful person, risking his life to save Gabi from incoming fire, bringing an injured enemy soldier in order to cure him in the trench, and taking care of a war veteran in the homeland.
StoryDuring the Marleyan war with the Mid-East Allied Forces, Falco is present among 800+ other Eldians fighting on behalf of Marley. However, he and some of his friends such as Udo, Zofia, and Gabi are valued as warrior cadets with the potential to inherit the Armored Titan power. During the fight, Falco and some of his comrades are hit by enemy fire, killing some but sparing Falco and leaving him wounded. His brother Colt appears to save him and puts his hard hat on Falco's head before carrying him on his back while avoiding enemy fire. When Colt returns to the hiding trench with his wounded brother, their fellow cadets tend to his wounds as Gabi re-explains their objective to him. When Udo begins to panic in fear of their military failing, he wraps Falco's bandages too tightly and Gabi scolds him. Falco then wonders why they are on the front lines as cadets and Gabi explains that it is so they may be evaluated by Commander Magath for their capabilities as successors to the Armored Titan power. When Zofia begins to boast about grades, Gabi interrupts her by explaining her superiority above all the other cadets. Falco then asks her about the item she is fiddling with and Gabi grins as she shows it to him.
When Gabi offers to take out the enemies anti-Titan artillery solo, Falco shows serious concern for her safety and fears she will be hurt. He watches her execute her plan of attack and once Gabi is successful in derailing the train, she begins to flee only to be shot at by one final surviving gunmen. This pushes Falco over the edge and he jumps out of the trench to try to save her. However, an ally named Porco Galliard transforms into a Titan and shields Gabi from gunfire while her and Falco collide as they both dive for the ditch. Falco looks in awe as the Titan stands above him and he watches as Galliard races off and kills the last gunmen.
After returning to the trench, Falco brings a wounded enemy soldier in order to heal his wounds. Although some of his companions, such as Udo, help him, his superior and Gabi mock him, stating that he is a weird person and that there is no way he will earn the power of the Armored Titan by fighting like that. After Udo translates the foreigner, Falco seems surprised of being insulted. Falco contemplates the airborne attack against Fort Slava and seems very shocked by witnessing Titans eating soldiers  and Reiner's defeat against the Armada.
After the battle, Falco is resting in the docks with his friends. They all seem worried, talking how Titans may no longer be the main force of the world. Falco tries to reassure Gabi, telling that Reiner has survived losing several limbs and even his head. After all see traumatized war prisoners and Udo gets angry because of the harm on Eldian reputation, Reiner arrives and is coldly saluted by Falco. After Falco suggest Reiner to rest, Gabi angrily replies that he is the one that should be resting.Some time later, Falco is inside a train heading towards their homeland. In their wagon, Colt gets drunk and starts praising Gabi along many other soldiers. Falco states how his brother gets very emotional whenever he drinks. Then tells Reiner bitterly how he has only two years left before dying and, if Gabi inherits the Armored Titan, her lifespan will only be 27 years old if she is not used as living Titan weaponry. After accusing Reiner of not caring about her, the sudden and incriminatory reply of the older warrior scares Falco. The boy proceeds to swear his loyalty to Marley and state how prideful is to inherit the power of the Titans. He finally states that he will be the one to inherit the Armored Titan power. Finally, Reiner tells him how he must surpass Gabi in order to protect her from this cruel world.
After arriving to Liberio, their hometown, Falco recalls how Reiner took full responsibility of the failure of the Paradis Island Operation, wondering why Reiner risks his his life and his power so many times. Reiner looks back at him and the boy looks away suddenly, asking himself why Reiner told him to protect Gabi and if the warrior actually wanted the war to end. His suspicious behavior catches Gabi's attention, who threatens to report his weird attitude. This makes all the other members laugh, without Gabi realizing why.
When the soldiers enter the Internment Zone, Falco and his brother are greeted by their parents. They seem very worried, asking the children about injuries and Colt's headache. Falco then sees a bunch of veteran Eldian soldiers, many of them with notable injuries. Falco asks Koslow about them, and he tells him that they have no family and will be treated at the hospital. The officer then imitates the sound of a bomb, scaring the traumatized soldiers just for fun. Falco decides to help calming down the soldiers and tells them that they will not have to fight any longer, as he fixes one soldier's armband.
As an Eldian warrior and possible candidate for the inheritance of one of the Titan powers, Falco has endured hard military training. He is skilled enough to have survived the battle of Fort Slava. He is a very athletic individual, being able to run at great speed in order to save Gabi from incoming fire.
- Colt Grice - Falco and Colt are brothers and share a fraternal bond. While Falco does not appear physically strong, his brother looks out for him and assures his safety even at the cost of his own.
- Gabi - The two are contenders for the inheritance of the Armored Titan power. Falco seems to have a crush on Gabi, expressing worry when she planed to sacrifice her life to blow up the anti-Titan artillery train and rushing to her side when she was about to get shot by a Mid-East Allied Forces soldier. Acknowledging that her lifespan would be reduced and she would die at a young age if she became a Titan shifter, he is willing to take her place.