Aleksin, a male alien clone, was a proficient combatant in hand-to-hand combat. During the time of the Galactic Civil War, Lando Calrissian enlisted Aleksin and his clone companion and romantic partner, Pavol, to aid in the theft of the Imperialis, the personal luxury vessel belonging to the Galactic Emperor, Sheev Palpatine. While investigating the Imperialis, Aleksin fell under the influence of the Sith helmet belonging to the Sith Lord Darth Momin. He then turned on Pavol, Lando, and Korin Pers. Ultimately, Lando killed Aleksin during their confrontation.
Aleksin functioned as an alien clone warrior. His lover and companion was his fellow clone Pavol. After crime boss Papa Toren hired Lando Calrissian to steal a luxury yacht that belonged to a wealthy Imperial, Calrissian and his associate Lobot sought out Aleksin and Pavol. They discovered the pair sparring with several dueling droids. Needing some fighters for the heist, Lando recruited Aleksin and Pavol.
Sporting stealth suits, Aleksin, Pavol, Lando, Lobot, and the Ugnaught Sava Korin Pers infiltrated Sienar Fleet Systems' Orbital Shipyard CC-24. After subduing the stormtrooper guards, the team absconded with the vessel and blasted into space. Before making the jump to hyperspace, the yacht's owner, Emperor Palpatine, dispatched Imperial Star Destroyers to reclaim his ship, the Imperialis. Aleksin, Pavol, and Korin observed as Lando executed a risky maneuver, using the tractor beam of one of the Star Destroyers to fly towards its companion. The two Star Destroyers collided, allowing the Imperialis to escape into deep space.
After the escape, Aleksin and Pavol embraced. They then joined Lando, Lobot, and Korin in exploring the ship's opulent treasures. While accessing the central chamber, Lobot was stabbed by two Imperial Royal Guards. While Lando and Korin evacuated Lobot to the med bay, Aleksin and Pavol took on the Royal Guards with sharp blades, who fought back with vibroblades. Using their melee combat skills, Aleksin and Pavol managed to defeat and kill the Royal Guards by the time Lando and Korin had returned with blasters. They subsequently discovered that the guards had been guarding several Sith artifacts including the mask of Lord Momin. This helmet belonged to the Sith Lord Darth Momin.
While Lando and Korin debated what to do with their loot, Aleksin stared into the Sith helmet. Consumed by the dark side of the Force, he activated a double-bladed lightsaber. When Pavol touched him on the shoulder, Aleksin went berserk and sliced off Pavol's lower right arm. As the two clones fought, Lando and Korin fled the chamber and shut the doors. Though Lando believed that Aleksin had got greedy and turned on them, Korin speculated that the had been corrupted by the Sith artifacts, pointing to the fallen Royal Guards.
Inside the chamber, Pavol tried to reason with his mate. Aleksin denied that anything had changed and taunted Pavol for losing his lower arm. When Pavol reminded him of their plan to get a clone that would be their child, Aleksin roared that no offspring of his would have a one-armed parent and claimed that he did not want a child anymore. Pavol denounced him as a monster. Aleksin taunted Pavol for giving into his anger. Pavol grabbed a vibroblade and the two fought.
Eventually, Pavol was also corrupted by the Sith artifacts. Armed with Sith lightsabers, the two cut their way out of the central chamber. They then confronted Lando, Korin, and the bounty hunter Chanath Cha and demanded that they leave the ship. When Lando refused to comply, Aleksin respond that their voices were sacred and meant to be heard only among their own people. He vowed to kill Lando and his companions with the exception of Sava Pers. Aleksin managed to entice Korin by offering to share the ship's treasures with her. He gave her the helmet of Momin.
Korin too was corrupted by the Sith artifact and agreed to join Aleksin and Pavol in killing the others. However, this was a ruse as Aleksin and Pavol had no intention of sharing their acquisitions. Aleksin stabbed Korin to death with his double-bladed lightsaber. Cha managed to shoot the door shut. Aleksin later confronted Lando as he was helping Lobot out of the medbay. Lando managed to convince Aleksin to switch off his lightsaber by convincing him to share the treasure with him and claiming that he did not know how to shoot. When Aleksin complied, Lando shot the alien warrior in the chest, killing him. Lando along with Lobot and Chanath then escaped the stricken Imperialis in escape pods before the ship blew up.
Aleksin, a formidable male clone warrior, belonged to an unknown alien species characterized by black skin. He possessed blue eyes, a feline-like head, and a humanoid body. He shared a romantic bond with his fellow clone, Pavol. The pair intended to use their share of the proceeds from Lando's heist to acquire a clone to raise as their own child. Aleksin demonstrated proficiency in combat with a variety of melee weapons, including staffs, knives, and even a double-bladed lightsaber.
Once Aleksin succumbed to the dark side's influence, his eyes changed to yellow. He rejected his love for Pavol and their aspirations of raising a child, instead embracing the treasure aboard the Emperor's yacht, Imperialis. After Pavol was corrupted as well, Aleksin tricked Korin Pers into lowering her guard by inviting her to join him and Pavol. Aleksin then killed her with his blade. Despite his skills as a warrior, Aleksin was tricked into lowering his guard by Calrissian's smooth talk. This cost him his life.
Aleksin made his debut as a supporting character in the 2015 Marvel Comics storyline, Star Wars: Lando. Charles Soule wrote the story, Alex Maleev provided the artwork, and Paul Mounts handled the coloring.