Aelan Kalder was a soldier who was male, Human, and possessed Force-sensitivity. He was a devoted comrade to Jedi Knight Jari Orez during the Cold War era, a period of tension between the Galactic Republic and the Sith Empire.
During the Galactic War, Aelan and Jari united with Guardian Hold Six on Corellia to fight against the Empire's forces. While Jari was inspecting the sentries stationed on Corellia, Aelan unexpectedly turned against him, using the Force to attack his own friend. It came to light that Aelan was a Child of the Emperor; however, when Jari engaged him in a duel, he detected no darkness within Aelan.
When Barsen'thor arrived on the planet to provide assistance to Corellia, Jari directed the Jedi Consular to destroy an Imperial factory located on Corellia and to prevent Aelan from causing widespread chaos across the planet. Jari sensed that a part of Aelan still retained goodness and was struggling to break free from the influence of the dark side. The Jedi eventually located Aelan within the factory and attempted to redeem him. Aelan, determined to avenge his brothers and sisters of the Emperor, engaged the Jedi in a lightsaber duel. Aelan was ultimately outmatched by the Jedi and was defeated. Following his death, Jari arrived and grieved the loss of his friend. He sensed that his friend was now free and had become one with the Force.
During the final confrontation with Tenebrae, Aelan's spirit was among those summoned to aid in the defeat of the former Sith Emperor. After witnessing Tenebrae's final demise, Aelan found solace in the light and became one with the Force.
As a Child of the Emperor, the resurrected Kalder fought with a lightsaber that emitted a yellow blade, and he possessed the ability to generate blasts of Force lightning. He received instruction in Form IV lightsaber combat, also referred to as Ataru.