Bloodedge Experience - Part 1
In his, presumed, late teens, Relius was a member of the Immortal Breakers, an organization for hire that dedicated themselves to the eradication of extremely powerful individuals. Relius joined the group under the pretext of needing the money to fuel his research on the perfection of the ultimate doll, something that also required numerous strong souls. With Valkenhayn R. Hellsing, the two of them were hired by the Mitsurugi Agency and kept under the management of Kiiro Hikagami. They were deployed to Shin Kawahama City, Japan, to find and kill Clavis Alucard, a vampire.
In October, Valkenhayn sensed the presence of a vampire and attacked Naoto Kurogane. It was only under Relius' insistence that the lycanthrope left him alone. As Valkenhayn left, Relius taught Naoto fighting techniques that could be used against immortals. He detected the presence of Raquel Alucard, and asked that she keep her presence better hidden lest she attract Valkenhayn again.
Later on, Valkenhayn and Relius found Clavis inside Naoto's apartment and battled against him. Relius, using his Drive, managed to suspend Clavis above the ground with various puppet arms. Unfortunately, they all fell to the floor as Clavis effortlessly and cleanly sliced them in two. As Valkenhayn was thrown out of the nearest window with Clavis following after him, Relius continued his pursuit. Ultimately, they were both unsuccessful with killing the vampire.
Bloodedge Experience - Part 2
In the same week of October, Kiiro had relocated Relius and Valkenhayn to destroying the numerous bugs created by Spinner Superior. The two of them talked about the reasons why they joined, and questioned who was dealing with the various Apostles located around Shin Kawahama. The both of them were interrupted by Saya Terumi, who attacked Valkenhayn because of his assault on Naoto earlier in the week. Relius watched on as they battled against one another, taking interest in a special technique employed by Saya that allowed her employ incredible speed and power. Even as Valkenhayn as edging closer to death, Relius took no part in the battle, but instead displayed interest in Saya's Drive - Soul Eater. Despite her Drive automatically making her a target for their organization, Relius asked that Valkenhayn did not kill the girl, but they were interrupted by Naoto, who had come to defend his sister.
Relius and Raquel took a backseat as Naoto and Valkenhayn were raring to fight against one another. Before the battle could commence, however, Spinner himself appeared and kidnapped Saya. Quickly creating a plan, Relius ordered Valkenhayn to help destroy the various sorcery circles that Spinner created in order to weaken him and allow Kiiro the opportunity to kill the mage. Kiiro eventually completed the plan, but Naoto had lost an arm and leg in the battle against Spinner. Relius went out of his way to fashion replacement limbs for the boy, creating an arm and leg that functioned as naturally as his real ones once did. Relius and Valkenhayn had kidnapped an unconscious Saya and taken her back to the Agency in the middle of the battle with Spinner, and were found by a man calling himself Hazama.
Prior to the beginning of the Dark War, Relius had become the leader of the Ten Sages - known as The One. He chose to collaborate with Shuichiro Ayatsuki, a world famous scientist, on the creation of something that could contact the Amaterasu Unit. One day, a man appeared who called himself Yuuki Terumi. This man offered the two scientists the chance to create a Kusanagi in exchange for the Susano'o Unit. Relius agreed to the proposition. It was also around this time that he had created an artificial human that he christened Kazuma Kval. Kazuma was kept in the Magister's City of Ishana and was designed as a vessel for Terumi.
Relius' single-mindedness on the creation of the Kusanagi led to Shuichiro creating a countermeasure called Kushinada's Lynchpin. Relius and Terumi failed to create the Kusanagi they desired, and instead created a Black Beast - a being that only seeks death and destruction. It swallowed Relius, destroyed Terumi's body and left Shuichiro for dead. Their experiment to create a being that could kill God instead initiated the Dark War, and the Black Beast wrought destruction on humanity for 10 years before being killed by the Six Heroes.
Ikaruga Civil War
Remix Heart, that which is inherited, Spiral Shift
After the annihilation of Ibukido, Relius visited the ruins, finding Meifang Lapislazuli there. He wondered how she had survived, marvelling at her soul. He had Ignis attempt to grab her, but the soldier relented, claiming her body belonged to the Imperator alone. Relius decided to observe her from then on.  Relius immediately went missing afterwards, having taken Ignis to be with himself and leaving Nirvana behind. Sector Seven had attempted to keep track of him with undercover assistants, but all five of them had disappeared without a trace. Carl came home not long afterwards, and found the incomplete Nirvana with Ada's body inside. 
He would later visit the Military Academy, eliminating the Guardian on the lower levels and telling Ignis to not pursue Cypher Albar as he was not worth their time.  On the higher levels of the Academy, he came across Mai Natsume, noticing her soul is both male and female before leaving, noting how intriguing such a phenomenon is. 
Upon learning that Meifang had plans for both Mai and Bell, Relius went to the Hazuki estate in the 11th Hierarchical City of Shinatsu. There, he incapacitated Houichirou Hazuki and Rin Hazuki, using sorcery specifically to prevent Rin from copying his techniques with Vision.  He held them there to prevent them from interfering with Meifang's plan, but let the couple free after stating that he would not go any further. Upon leaving the estate, Rin prevented Houichirou from attacking Relius, and the Colonel noted that Meifang had become boring. 
According to the instructions of the Imperator, he arrives in the Thirteenth Hierarchical City "Kagutsuchi" to monitor Hazama's actions. He fundamentally carries no interest in anything other than his research, and even his own son Carl is not an exception.
To him, all phenomena are nothing but "experiments." Such is the man called "Relius Clover." The creator of the Boundary Interface Prime Field Devices, as well as the Colonel of the Engineering Department for the current Novus Orbis Librarium, he created "Kushinada's Lynchpin" a long time ago together with "Shuuichiro Ayatsuki." Knowing that the Lynchpin now lies within Ikaruga, he begins searching for it.
A month after the events in Kagutsuchi, Relius was given a job by Izanami – to activate the cauldrons across the Ikaruga Region to enact their plan for Doomsday. He returned to the Magister's City of Ishana and asked about the condition of her vessel before delivering his report on the progress that had been made. Relius left as he complimented the Imperator on never boring him. He learned that Azrael had been released from the Dog House and that Kokonoe had escaped. Relius correctly assumed that she would be heading to Ikaruga, and made his way to a lab where Litchi was working. Complimenting her on the work she had accomplished, he took over, and told her that he had made her Arakune's Observer. Immediately afterwards, he called Hazama and asked for a favour. He found Hazama later on and assured him that the vessel he prepared for Phantom was good and Izanami was sustaining him.
Relius continued his job of activating the cauldrons around Ikaruga. When he arrived in the 9th Hierarchical City of Akitsu-Kou, he intended to activate the cauldron there, but found Jin Kisaragi blocking his path. Intrigued at the young man's ability to sense whether the cauldron was dead or alive, he still wanted to continue his mission. Jin blocked him, but both Relius and Ignis defeated him, with the Colonel employing a technique taught to him by Izanami to do so.
In the 7th Hierarchical City of Kazamotsu, Relius called Litchi and asked her to look at seithr readings in the city, discovering that they had fallen and risen at inexplainable rates over the last three days. He incorrectly believed it to be the Lynchpin's doing, and had Arakune investigate. Carl found Relius and the two battled after Relius remarked that he would break his hatred, dodging questions about Litchi. After the battle, Relius promised Carl that he would rebuild Ada in the future when he was ready. Arakune soon came back to report his findings to Relius, telling him that both Ragna and Noel were in the NOL branch in Yabiko. Satisfied, he wondered what Kokonoe would do with the Lynchpin and sent Arakune away to Hazama. When Terumi and Phantom arrived from their journey in Yabiko, the God told Relius that Celica was in the modern world, resurrected as a Chrono Phantasma, piquing the scientist's interest.
Relius was present when Izanami ordered the destruction of Takamagahara. He told her that all the cauldrons in Ikaruga were activated, and Doomsday was soon to commence. Relius then took Litchi, Ignis, and Nu to the 8th Hierarchical City of Wadatsumi where the Lynchpin was waiting. He battled against Ragna. When the Ex Machina: Minerva appeared to protect Celica and stop Nu from killing Noel, Relius complimented Kokonoe on its design. He stopped Ragna from progressing and told him that he had released all the cauldrons in Ikaruga, and that the world was insane since it repeated The Origin's finite memory. Carl soon joined his father in the battle, but thanks to Tsubaki and Makoto joining the opposition, Ragna, Celica, and Noel escaped. Relius and Carl made for an insanely strong team with their automatons, leading to the opposition having to take them on separately. Relius battled Bang alone.
Valkenhayn appeared, battling Relius and giving Bang enough time to jump on top of the Lynchpin, which was teleported away by Rachel. Shortly afterwards, the flow of seithr in the world was halted. Relius had failed, but before Valkenhayn could kill him, Nirvana blocked the blow and the group retreated. He asked Carl why he saved him, and was told that he still had a promise to keep – Ada's revival. The mad scientist laughed to himself and told his son that he would make good on his promise.
Litchi stormed into his office and demanded to know where Arakune was – he let her know that he had already sent the monster into the Ikaruga Region. He returned to Ishana and watched as Izanami went into the cauldron to activate Takamagahara.
Later on, Relius was approached by Hazama in his lab. The scientist told him that he was aware of Bullet and Bang Shishigami roaming Ikaruga but had allowed them to do since they had the Phoenix: Rettenjo. He then left his lab, not telling Hazama where he was heading. He was in the Grave Marker of Bases and was found by Litchi, Kokonoe, Bullet, Bang, Kagura, and Makoto. He revealed to them all that he was going to create another Black Beast using some of Litchi's research and would have Arakune serve as the foundation for the monster.
At some point, Relius battled against Valkenhayn, defeating him and moving onward. He only battled him because of their old friendship, and remarked how Valkenhayn did not interest him at all.
The colonel of the Novus Orbis Librarium's Engineering Department, and the creator of the Boundary Interface Prime Field Devices. He fundamentally carries no interest in anything other than his research, and even his own son Carl is not an exception. Bringing along his wife, whom he had altered into the "Detonator," he investigates the gathering of the Chosen in Kagutsuchi.
Like many others, Relius was absorbed into the Embryo and became one of the chosen – Ignis still accompanied him. His memories were completely unaffected, unlike many others who had been taken inside it. He found Makoto in the Kagutsuchi museum and began commenting on the strength and brightness of her soul despite her being taken into the Embryo.  He later found Izanami bathing, and they discussed her vessel and the creation of Prime Fields before leaving for Ikaruga. 
Independently, he found Nine and the two began discussing the Nox Nyctores, the Dark War, and how to remove the Tsukuyomi Unit that was protecting Amaterasu. He suggested contacting Hazama as he believed him to be bored with nothing more to do.  A short time afterwards, he found Litchi, and commended her on being able to hold herself together inside the Embryo and using Lao Jiu to retrieve memories from the Boundary. He did warn her, however, that her body will deteriorate if she comes too close to Arakune  In Akitsu, he found Ragna investigating the cauldron, and was fascinated at how he was able to hold his sense of self despite not being chosen. He battled him to verify some speculation and left soon afterwards after asking him to fight Izanami so he could watch the aftermath.  The puppeteer later found Nu being assaulted by Arakune and he repelled the monster, then offered to conduct repairs on the Murakumo Unit. 
His son had found him eventually, and asked Relius if he could be taught of his father's knowledge. Relius agreed to help Carl, interested in what in his son could do with all of his knowledge. With this, Relius explained to him the Prime Field War,  and how he had seen it with his own eyes, verifying the information.  He sent his and Ignis' information into the Embryo, finding Hakumen and Tsubaki within it – the data fought the member of the Six Heroes, and evaporated after it had observed what Relius needed.  He told Terumi the shape of Hakumen's soul and soon left the Embryo using the Boundary as a travelling device with Ignis as the method to survive inside it, having observed everything he desired after giving Carl one of his “eyes”. 
- BlazBlue: Bloodedge Experience - Part 1, Chapter 2 - Immortal
- BlazBlue: Bloodedge Experience - Part 1, Chapter 3 - Mitsurugi
- BlazBlue: Bloodedge Experience - Part 2, Chapter 10 - Encounter
- BlazBlue: Bloodedge Experience - Part 2, Chapter 11 - Fusion
- BlazBlue: Bloodedge Experience - Part 2, Epilogue
- BlazBlue: Bloodedge Experience - Part 2, Outside Chapter
- BlazBlue: Phase 0, Chapter 1 - Lost White
- BlazBlue: Phase Shift 1, Chapter 6 - Voice of Emerald Evil
- BlazBlue: Phase 0, Chapter 5 - Sealed Green
- BlazBlue: Variable Heart, Chapter 14
- BlazBlue Material Collection, Carl Clover Short Story - Puppeteers
- BlazBlue: Remix Heart, Chapter 17
- BlazBlue: Remix Heart, Chapter 19
- BlazBlue: Variable Heart, Chapter 15
- BlazBlue: Variable Heart, Chapter 18
- BlazBlue: Continuum Shift Extend Official Site (JP), Relius Clover
- BlazBlue: Chrono Phantasma Official Site (JP), Relius Clover
- BlazBlue: Chrono Phantasma, Story Mode, Prologue
- BlazBlue: Chrono Phantasma, Story Mode, Chrono Phantasma, Episode 2: Difference of Opinion
- BlazBlue: Chrono Phantasma, Story Mode, Chrono Phantasma, Episode 05: The Guided
- BlazBlue: Chrono Phantasma, Story Mode, Chrono Phantasma, Episode 8: Reunion
- BlazBlue: Chrono Phantasma, Story Mode, Chrono Phantasma, Episode 12: Uninvited Guest
- BlazBlue: Chrono Phantasma, Story Mode, Chrono Phantasma, Episode 16: Kushinada's Lynchpin
- BlazBlue: Chrono Phantasma, Story Mode, Chrono Phantasma, Episode 17: Doomsday
- BlazBlue: Chrono Phantasma, Story Mode, Episode 18: Beginning of the End
- BlazBlue: Chrono Phantasma, Story Mode, Sector Seven, Episode 2: Unwavering Feelings
- BlazBlue: Chrono Phantasma, Story Mode, Sector Seven, Episode 3: The Melancholy of Celica
- BlazBlue: Chrono Phantasma, Story Mode, Sector Seven, Episode 8: The Forbidden Research
- BlazBlue: Chrono Phantasma, Story Mode, Sector Seven, Episode 9: The Beast
- BlazBlue: Chrono Phantasma, Story Mode, Six Heroes, Episode 8: Bonds of Fate
- BlazBlue: Central Fiction Consumer Edition Official Site (JP), Story - Relius Clover
- BlazBlue: Central Fiction, Episode 003, Chapter 018, Sub Scenario 1
- BlazBlue: Central Fiction, Story Mode, Episode 005, Chapter 035
- BlazBlue: Central Fiction, Story Mode, Episode 005, Chapter 039
- BlazBlue: Central Fiction, Story Mode, Episode 006, Chapter 041, Sub Scenario 1
- BlazBlue: Central Fiction, Story Mode, Episode 006, Chapter 048
- BlazBlue: Central Fiction, Story Mode, Episode 007, Chapter 051, Sub Scenarion 1
- BlazBlue: Central Fiction, Story Mode, Episode 010, Chapter 081
- BlazBlue: Central Fiction, Story Mode, Episode 010, Chapter 081, Sub Scenario 1
- BlazBlue: Central Fiction, Story Mode, Episode 011, Chapter 091
- BlazBlue: Central Fiction, Story Mode, Episode 011, Chapter 093