Kazuma Kval

Kazuma Kuvaru is the protagonist of the novel Phase Shift 1 and a major antagonist throughout the rest of the Phase Shift novels.

Information
Suffering from amnesia and hallucinations, Kazuma is unable to remember anything seven years prior (to the start of Phase Shift 1). He disliked physical activities, and preferred to stay in-doors reading. He is completely oblivious to how he ended up studying in the Magic Guild, with Professor Relius Clover as his assumed guardian. He lives everyday without a clue as to why he exists at all.

In truth, Kazuma was actually a body created by Relius for Yūki Terumi to fuse with (after he was damaged by the Black Beast before the Dark War). During Phase Shift 1, he and Terumi met, with the latter promising to help him change the status quo if he could get the Azure. Kazuma initially rejected Terumi due to the unusual aura around him, but when Terumi saved him from three Kaka assassins, he agreed. This relationship eventually twisted Kazuma's personality, making him betray Nine, Trinity Glassfille and Celica A. Mercury's trust. He talked Celica into leaving the island to search for her father so that seithr could spread into the island, which would force the Ten Saints to deal with it, and in turn, giving Kazuma an opening to infiltrate their Cathedral.

In the end, Kazuma ended fusing with Terumi, at the same time acquiring the Nox Nyctores Ouroboros. After this event, he was later caught by Valkenhayn R. Hellsing and sealed by Clavis Alucard.

As Terumi's knowledge was needed to defeat the Black Beast, Nine temporarily broke his seal, placing the mind-control spell Ruby: Mind Eater on him as an insurance. However, as Kazuma and Terumi were still separate entities in their own rights, only Terumi was affected by the Mind Eater, whereas Kazuma was unaffected. His mind now similar to Terumi's due to their time spent together, Kazuma took over his body and acted in a similar grace to Terumi to try and con the Six Heroes into thinking that Mind Eater had truly worked and that Terumi, and Kazuma by extension, were under their control.

With the Six Heroes fooled, Kazuma took the opportunity to prey on Trinity. By using the close relationship they had forged in the Magic Guild, Kazuma managed to convince her to release Mind Eater on Terumi by fooling her into thinking that Terumi himself would murder Nine. When both Nine and Trinity were disposed of by Kazuma, they encountered Hakumen and Jubei. After Jubei successfully managed to separate Kazuma and Terumi using his brother's Sekigan (隻眼), given to him by Rachel, Hakumen grabbed hold of Terumi, now in his 'ghost form', and jumped into the Gate while Jubei closed it. According to Terumi's last words, his vessel would be destroyed by the Boundary, but Kazuma's fate was ultimately left unknown.

Appearance
Being created in the likeness of Terumi, Kazuma bears a strong resemblance to him, except his bangs hang over his eyes. He wears a standard Magic Guild uniform with a purple ribbon tie and a black cape, along with a matching pair of black pants. He has a very pale complexion.

Personality
Originally, he was a kind, curious, and sometimes weird person. His personality was the exact opposite of Terumi's, but they shared the same hobbies. This all changed when Terumi began making him doubt the people he believed he could trust and as a result he began adopting Terumi's depraved mentality over time. After finally fusing with Terumi, his influence completely took over Kazuma's mind and he no longer cared for others or even the affection that Trinity Glassfille showed him, eventually using those very feelings she had to manipulate her.

Trivia

 * When Amane Nishiki uses his Astral Heat on Hazama, Kazuma appears. Somewhat humorously, he is seen marveling and observing at the boiled egg he has in Phase Shift 1.