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He speaks in an overly formal manner and does things strictly by the [[Codex Astartes]]- so much so that Leandros is very enthusiastic about doing things just as the Codex pertains right. However , this has led him to often speak with little tact, as Leandros believes all actions must serve the [[Emperor]]. This belief has caused Leandros to question the motives of anyone he suspects of not giving their all for the [[Imperium]]. He also looks up to his fellow Ultramarines, [[Veteran Sergeant]] [[Sidonus]] and especially his [[Space Marine Captain|Captain]], [[Titus (Captain)|Titus]], whom Leandros sees as the type of Ultramarine he aspires to become. However, Leandros will sometimes goes go overboard in pursuing what he thinks is a noble course of action, because he wants to prove himself and his abilities.{{Fn|1}}

Leandros was the most recent member of [[Space Marine Captain|Captain]] [[Titus (Captain)|Titus]]'s [[Command Squad]]{{Fn|1}}, when he took part in defending [[Graia]], after it was [[Graia Invasion|invaded]] by [[Warboss]] [[Grimskull]]'s [[Waaagh!]]. However , the [[2nd Company (Ultramarines)|2nd Company]]'s fleet came under attack by the [[Orks]], when they arrived at the [[Forge World]] and Titus deployed them, while the Company was under fire{{Fn|2a}}. This chaotic deployment led the Ultramarines to be separated, but Leandros soon regrouped with Titus and their fellow Ultramarine [[Sidonus]]{{Fn|2b}}. The three would fight beside [[Lieutenant (Imperial Guard)|2nd Lieutenant]] [[Mira]]'s [[203rd Cadian]] [[Regiment]] against the Orks{{Fn|2b}}, but Leandros thought little of the [[Guardsmen]]. His ascension to an Ultramarine had caused him to lose his [[Human]] perspective. Leandros was especially patronizing to the surviving Guardsmen he encountered on Graia{{Fn|1}}. In the course of defending the [[Forge World]], with the Cadians, though, Titus' group crossed paths with [[Inquisitor]] [[Drogan]].{{Fn|2c}}

The [[Inquisitor]] was on [[Graia]] developing a weapon powered by the [[Warp]], called the [[Psychic Scourge]], and required their help in defending it. [[Titus (Captain)|Titus]], [[Sidonus]] and Leandros succeeded in saving the Scourge from the [[Orks]]{{Fn|2c}}, though in the process the Captain is forced to grab hold of the Scourge. This surprises [[Drogan]], however, as anyone who made physical contact with the weapon, should be killed by it, as : the Scourge is empowered powered by the unstable Warpenergies. Leandros makes note of notes this and becomes , suspicious as to how Titus was able to survive. The Captain states that he does not know, but orders them to move and leave before the Orks attack them again. Leandros reluctantly drops the matter,{{Fn|2d}} and the Ultramarines escort the weapon and Inquisitor to another base where it could be used. In doing so, [[Drogan]] hoped the weapon would defeat [[Grimskull]]'s invasion. However , when the weapon was activated, it instead opened a [[Warp Rift]] above the [[Forge World]] and allowed the [[Sorcerer]] [[Nemeroth]]'s [[Chaos]] forces to invade Graia. It was revealed that [[Inquisitor]] Drogan had been slain before he made contact with Titus' group and had already been possessed by a [[Daemon]] serving Nemeroth. Before the three Ultramarines could be killed by Nemeroth, however, [[Warboss]] [[Grimskull]] attacked the [[Sorcerer]] and the Ultramarines were able to reclaim the Psychic Scourge{{Fn|2e}}. Under Titus' orders, the group then used the [[psychic]] weapon to empower the [[Imperial Titan]] ''[[Invictus (Titan)|Invictus]]'', which fired upon the Warp Rift and weakened it. AfterwardsAfterward, Titus gave the Scourge to Sidonus and ordered the Veteran Sergeant to take it to their [[Strike Cruiser]] ''[[Fury of Descent]]'', for safekeeping. The Captain and Leandros then kept Nemeroth's forces at bay, while Sidonus raced towards a landing pad to wait for an aircraft to evacuate him. However , when he reached it, Sidonus was killed by Nemeroth who teleported behind the Veteran Sergeant and impaled him on the Sorcerer's with [[Lightning Claw]]s. Titus and Leandros saw this, but they were unable to save Sidonus before he was killed and Nemeroth escaped with the Psychic Scourge.{{Fn|2f}}

A vengeful [[Titus (Captain)|Titus]] then told Leandros to safeguard [[Sidonus]]' body until an [[Apothecary]] arrived, and to then join the Imperial counter-attack against the invaders. The [[Space Marine Captain|Captain]], however, planned to hunt down and kill [[Nemeroth]], before the [[Sorcerer]] could use the [[Psychic Scourge]]'s power to become a [[Daemon Prince]]. Leandros vehemently disagreed with this and stated Titus' course of action was suicide or worse. He explained that the Captain had show shown repeated resistance to the [[Warp]], since Nemeroth had invaded [[Graia]]. A ; a fact that the Sorcerer was aware of and Nemeroth was now , interested in Titus' ability. Though Leandros denies denied fearing that Titus would fall to [[Heresy]], he believed that whatever was behind the Captain's resistance could would only aid the Sorcerer. Titus disregards, Leandros' concerns and insists that he will not embrace Heresy, before leaving to confront Nemeroth{{Fn|2f}}.

However , Leandros ' concerns about the Captain's ability, led him to become convinced that Titus had become corrupted. He then made contact with ; contacting the [[Inquisition]] and , he claimed that Titus was a [[Heretic]]{{Fn|2h}}. Meanwhile, the Captain succeeded in killing Nemeroth and closing the [[Warp Rift]]{{Fn|2g}}, as more Imperial reinforcements arrived. Despite his success, thoughthis, Leandros' charge of Heresy against Titus led him, led Titus to be taken into custody by [[Inquisitor]] [[Thrax]]. Before he was escorted away, however, Leandros told Titus that the [[Codex Astartes]] left no doubt that the Captain was a Heretic. No ; no one could resist go unscathed from contact with the Warp as Titus had done otherwise. The Captainrebuffed him, though, stated saying that while the Codex was a set of rules that guided the Ultramarines. It guided them and instilled honor within the Ultramarines. But it was , how each member of the Chapter lives they lived with those rules, is was the true test of a [[Space Marine]]. A : a test, Titus concluded, that Leandros had ultimately failed.{{Fn|2h}}

Over a century later, Leandros had managed to has become a [[Chaplain]] within the Ultramarines 2nd Company. Hiding his identity from the returned [[Demetrian Titus]], he closely monitored the now-[[Lieutenant]] and was distrustful of his purity. After Titus helped defeat [[Imurah]] and his [[Thousand Sons]], Leandros revealed his identity to Titus and stated he would be keeping a close eye on him.{{Fn|3b}}