Before Kingdom Hearts Union χ[Cross]
Lauriam awakes as a Keyblade wielder in Daybreak Town, where he joins one of the Unions under the foretellers. Two years later, and with the Keyblade War looming on the horizon, Lauriam is approached by Ava and asked to join the Dandelions and become a Union leader, explaining the circumstances concerning the end of the world, as well as providing him a rulebook and instructions for what to do after the Keyblade War.
Sometime before they left for the new world, Lauriam and Strelitzia discuss their duties as Keyblade wielders. Although Strelitzia considers him to be a prodigy, Lauriam notes that she is superior in magic compared to him. Lauriam declines Strelitzia's suggestion to team up, but states that he will consider it in the future when she is stronger. Strelitzia confides in Lauriam about her reluctance to join the Dandelions and how she wishes to see Player again, leaving Lauriam to believe that she had feelings for the latter. He encourages her to meet with Player and promises that he will come to save if she is in trouble.
Kingdom Hearts Union χ[Cross]
After the Keyblade War, when the Dandelions had all crossed the world line to escape the destruction of the world, they lost all their memories and had to relive their experiences from the old world until they reach the time of the Keyblade War, at which point they would overwrite the tragedy with new experiences. During this time, a Union χ[Cross] is instituted, allowing the Unions to intermingle for a time.
When the time comes for the new Union leaders to gather, Lauriam is the last to arrive at the Keyblade Graveyard as per Ava's instructions. He apologizes to Ephemer, Skuld, Ventus, and Brain for his tardiness, claiming that he had been looking for something, and introduces himself to the group.
The Union leaders then go to Daybreak Town and enter the Foretellers' Chambers. When Skuld proposes that they choose which Union each of them will lead, Ephemer recommends that they maintain the Union χ in order to prevent the conflicts of the past world, with the other Union leaders agreeing to reconstitute the old system later as stated in the rulebook. Brain suggests that, while the Dandelions are reliving the events of the past, they collect the necessary ingredients to create new Spirits, and sends Ephemer, Skuld, and Ventus to collect the ingredients while he and Lauriam stay behind to make the necessary preparations.
Despite his searching, Lauriam is unable to find his sister, Strelitzia, who was also meant to be among the Dandelions. When inspiration strikes, Lauriam finds Ephemer ruminating about the Shift Pride, which is a friendly competition among the Dandelions. While Ephemer doesn't want to make Keyblade wielders fight one another again, Lauriam is confident that he would find a solution, before attempting to leave to attend to matters of his own. When Ephemer questions Lauriam on this, Lauriam reveals his search and explains that, since the worlds the Dandelions visit in the new world are data backups, every time the Dandelions visit them, their data would be saved as well, thus Lauriam reasons that, if they did make the crossing, this individual would be present in the data. This is later the inspiration for Ephemer to have the Dandelions compete with the data versions of one another in the Shift Pride.
When the data search proves unsuccessful, Lauriam asks that Brain relay that his vote for the Shift Pride would be the same as whatever Ephemer chose, so that he could continue his investigation. Lauriam seeks out Elrena, knowing that she had, on occasion, been in the same party with Strelitzia.
Recalling that her Chirithy was friends with Strelitzia's own Chirithy, Elrena summons it. After her Chirithy reveals that Strelitzia had been looking for someone in order to induct them into the Dandelions, as well as a connection between Strelitzia's last known whereabouts and Skuld, Lauriam parts ways with Elrena in order to confront Skuld. However, having not known Strelitzia, Skuld cannot help Lauriam, and so he assumes that Strelitzia might have chased after the unknown individual she was pursuing and gotten herself caught up in the Keyblade War after all. Brain notes this as being odd, as Strelitzia was pursuing this individual in order to get them to join the Dandelions, despite being hesitant before ultimately joining them herself. This reminds Ephemer of Player, who was offered a place among the Dandelions, but ultimately declined and battled in the Keyblade War, and so Ephemer agrees to introduce Lauriam to Player.
Though once again, nothing comes out of their conversation. Lauriam asks that Player keep Strelitzia in their heart, before departing in order to reconvene with Elrena.Upon his arrival, Elrena explains that she and her Chirithy had investigated the building where Strelitzia was last seen, where they saw a flicker of Noise that resembled her. Hearing this, Lauriam storms inside, desperately calling out for her to no avail, as Elrena explains that they tried to make the Noise appear by entering and exiting the building multiple times already. Furthermore, Chirithy mentions that Strelitzia's Chirithy had revealed that she was looking for Player in order to save them from the Keyblade War. Though Elrena has no memory of it since crossing the world line, Lauriam surmises that Strelitzia was sure it was going to happen, and questions whether or not Brain knew something more based on what he'd said earlier.
Lauriam returns to the Clock Tower, entering the Control Room alongside Skuld, where Ephemer and Brain explain the situation: a new world that had not existed in their world or time had appeared, and when this world connected to theirs, glitches began appearing. Brain had since managed to stabilize the connection, and Player and Ephemer had gone to this new world to investigate. Ephemer adds that they'd pursued Darklings into this new world, and soon after enemies from their world began appearing in this new world, suggesting that the Darklings were responsible. Along with Ventus, Lauriam also mentions having seen a Noise of Strelitzia as well. With all of the evidence presented, he hears of Brain's conclusion that they must be in the data Daybreak Town, completely cut off from their original world as well as unknowning of its state and with no possible way of returning. Despite suggesting that all this may have been someone else's plan, Lauriam hears his comrade reconfirm his promise to get them out.
Afterwards, Lauriam meets up with Brain discussing concerns about his sister Strelitzia, informing his comrade that he spoke with his sister's friend and that she was aware of the incoming Keyblade War and tried to invite Player but couldn't figure out why the refused. She understood that theeir actions confirmed the war was coming. Then, Lauriam gives Brain time alone to think and tells him he'll be waiting if he needs him.
Lauriam later discovers Maleficent within the Clock Tower. Having reached the lifeboat, he engages her in battle, but is defeated and the lifeboat is destroyed.
While unconscious he remembered that last time he talked to his sister. However, Lauriam was shocked she was gone and couldn't find her until he saw her in a white coat, flying into the sky. He comes to, seeing that Maleficent was gone and slowly limps out of the room thinking of Strelitzia.
Making his way back to the others, Lauriam overheard and misunderstood them talking about Strelitzia and bursts through the door. Despite his friends' concern, he shrugged them off, demanding that Brain to tell him what he knew about his sister. Seeing Brain remain silent, he pushed Ephemer away not wanting him to interfere, then heard about Brain's suspicions about the Darkness. He broke down feeling very confused; just as the others tried to calm him and explain, Ventus arrives, painfully admitting that he killed Strelitzia. Consumed by anger, Lauriam demanded Ventus tell him what he did to her. Furious, he nearly attacked him with his Keyblade only to be blocked by Ephemer. They were about to fight, but were halted when Ventus collapsed on the ground as the Darkness emerged from him.
When Lauriam asks Darkness why it killed his sister, the entity answers that it was Ventus' desire for power. But as the conversation continues, knowing that Ventus would never resort to such means, he concludes that Darkness could have come for any one of them regardless. Enraged that his sister died for nothing, Lauriam attacks Darkness, but is easily knocked unconscious.
After waking up, Lauriam accepts the truth about who really killed his sister and fights alongside his comrades. With Player's rival, he rebelled in confidence that they could defeat the Darkness and return to the real world. The entity scoffed at them, asking how they would accomplish it, and he replied by using the lifeboat as Maleficient had. However, he and the others were ridiculed for their cluelessness as the entity explained the true purpose of the lifeboat and how with Maleficient's departure, the lockdown had already started. As that sank in, Lauriam stated that they were nothing but pawns. Despite them briefly defeating the entity, it was unable to be destroyed with no form. Afterwards the Darklings appear, and Lauriam realizes they were after Ventus. He and the others watch as their unconscious comrade rises up enveloped in light, which dispells the creatures of darkness. Vowing to use the light inside of him to reform the entity into something they can destroy, he becomes concerned for Ventus regardless and watches as his comrade fights on alone.
After the battle, Lauriam apologizes to an unconscious Ventus for his actions and began to wonder if the darkness was truly gone or if it was still inside of him. He was consumed by dark thoughts again until he felt the gentle touch of his sister. He was approached by Elrena, who had news of his sister. From Elrena's Chirithy, he and the others learned that it saw someone that looked like Strelitzia following someone in a black coat but knowing of his sister's fate Lauriam wondered how it was possible. But remembering that they were in Data-Daybreak Town, just as the town's data was transferred over so was theirs, however Lauriam wondered why his sister's data was accessed and held onto hope that she could be brought back. Remembering his previous endeavors, he suggested looking in the real world with little time to decide carrying Ventus, he and the others head to the basement below.
Reaching the Ark room the group discovers that the room is wrecked with only five pods left and with the data world deteriorating further the Union Leaders had to be quick. So they split up, Lauriam goes with Brain and Ventus to the real world in order to search for clues about his sister with Elrena accompanying her while the others stay behind.
Seeing the world being destroyed and aware that everyone couldn't be saved in an attempt to save Player, Ephemer and Skuld; Luariam and the others are launched by Brain into the future but was hesitant on leaving Brain but his comrade said it's only way to keep hope alive. He is reminded to keep his goal as a waypoint before leaving he hoped that they would meet again and that his heart is his guiding key but just before Lauriam and the others left he noticed the place starting to break apart and was greatly concerned for his friend as he was sent off. Afterwards, Lauriam ends up separated from the others and unconscious in a flower glade in the Dwarf Woodlands.
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Lauriam has shoulder-length pink hair and dark blue eyes. He wears a large-collared white button up shirt with large cuffs beneath a black vest with tattered ends at either side on the front and a tattered longer coattail style addition in the back. He also dons dark pink pants and sleek black boots.
Lauriam possesses a polite and reserved disposition. He is shown to be playful and encouraging towards his sister. Underneath, when provoked, he is shown to have a fierce temper as shown when he demands for the others to give him answers to what happened to his sister. He also tends to jump to conclusions, believing his comrades had something to do with Strelitzia's disappearance even though they were innocent. He was so desperate for answers that he was willing to use force to get them, as he nearly struck Ventus with his keyblade and was willing to fight Ephemer to get the answers he sought.
After being told the truth, he becomes very remorseful about his actions towards Ventus.
Lauriam wields the third form of the Divine Rose Keyblade. According to Strelitzia, he was far superior in strength compared to her.