Furlan was a young man with light gray eyes and dark blond hair. His bangs hung over his forehead, between his eyes. Before he joined the Scout Regiment, Furlan's civilian clothes featured a simple long-sleeve white shirt with a light blue vest and knee-high boots.
Furlan, in contrast to Isabel, was very focused and able to make the distinction between when to have fun and when to be serious. Like Levi, Furlan was usually depicted as level-headed and calm, but he disliked when things got out of control. He had a clear understanding of when he was defeated, and stopped resisting if he knew that he had lost; this was shown during his capture by the Scout Regiment. Furlan placed a great deal of trust in Levi and followed his decisions and leadership without question.
Prior to the fall of Wall Maria, Furlan was a delinquent roaming the capital's Underground District. At one point, Furlan decided to test Levi's strength by having him fight a group of thugs. Furlan's plan was to see if Levi was worth recruiting into his group of thugs or not, and he was surprised to see Levi beat them all single-handedly. He decided to join Levi, though how he convinced Levi to let him join him is unknown, as he neglects to tell Isabel the rest of his story.
Furlan, Levi, and Isabel were notorious for having a strong reputation due to Levi's strength. After the three obtained and became skilled using omni-directional mobility gear, they would use it around the Underground City, as it made their illegal business easier to accomplish and gave them hopes of rising above their lives in the city. Furlan eventually found himself and his companions captured by Erwin Smith of the Scout Regiment. When Levi was blackmailed into joining the Corps, Furlan and Isabel chose to follow him, and all three resolved to one day claw their way into a better life on the surface.
On his first expedition outside the Walls, Furlan assisted Levi in taking down an Abnormal Titan. While obviously nervous and unsettled at the thought of fighting a Titan, he gained his courage and morale upon seeing Levi charge into battle. Isabel distracted another Titan while Furlan finished it off, marking his first kill.
The next day of the expedition, during heavy rain, Levi decided to take the chance to hunt down Erwin and complete their original mission, using the rain to his advantage. Furlan advised caution, but Levi brushed him off. Despite Furlan's protests, Levi forced the conversation to a close and set off to kill Erwin. Levi looks back to see Furlan staring after him faithfully and Isabel waving wildly.
After realizing that he had passed a large group of Titans heading in Furlan and Isabel's direction, Levi returned in time to find that their squad had been wiped out, and witnessed Furlan being bitten in half by a Titan.
Furlan stole omni-directional mobility gear and, along with Levi and Isabel, trained himself to the point of proficiency and used it on their underground missions. He almost escaped from a Scout Regiment squad, mankind's greatest soldiers, and he stated that he, Levi, and Isabel had escaped from the Military Police several times before.
He seemed to be smart and skillful, as seen when he confessed that he trained himself with the omni-directional mobility gear and in his ability to keep a cool head.
- Levi - Having heard rumors of Levi's strength, Furlan originally set up a test to see how strong he was. He was amazed at Levi's skill and hoped he could convince him to join his gang. After Levi refused, he joined up with Levi instead. The two became close friends, with Levi greatly valuing Furlan's opinions and strategies.
- Isabel Magnolia - Though they were usually at constant odds with each other, they were close friends and showed a great level of cooperation and synchronization. With few words between them, they operate with extreme precision.
- Yan - Furlan cared for Yan's health and worried so much about Yan's leg injuries that he paid Yan more than his share. Yan being taken to a hospital and treated on the surface was the reason for Furlan, Levi, and Isabel to take on the mission that led them to join the Scout Regiment.