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Mizar is prideful and arrogant as being a "[[Galaxy-Eyes]]" master, shown when he obtained his [[Number 107: Galaxy-Eyes Tachyon Dragon|Over-Hundred Number]] through a [[blank card]], despite the [[Monster Card|monster's]] tremendous power. Due to this he eventually develops a rivalry with [[Kite Tenjo]], being the only other known "[[Galaxy-Eyes]]" master in order to prove who is the superior between both of them.<ref name="ep83" /> Unlike Girag and Alito, Mizar is shown to be straightforward and serious, as when he arrived on [[wikipedia:Earth|Earth]], he began his mission right away - giving Girag and Alito their [[Barian Sphere Cube]]s, and then moving on to find [[Yuma Tsukumo]] - whereas the other two remained distracted with their antics, to which he chastises the two for letting them get in the way of their goal.<ref name="ep82" /> However, he seems to enjoy showcasing his powers, as Alito stated his entrance was "overly flashy".<ref name="ep82" />

Due to his arrogance, Mizar is shown to be obstinate at times, as he refused to believe from both [[Dumon]] and [[Jinlong]] that he and his comrades were humans once, although this subsides if evidence is given against him. He was also somewhat reluctant to abandon his second Duel with Kite when the power released by [[ZEXAL II]] damaged [[Sargasso the D.D. Battlefield|Sargasso]]. In his final duel against Kite, he stubbornly refused to believe that his "Tachyon Dragon" was part of a curse created by [[Don Thousand]] and that his dragon would not betray him<ref name="ep135" />.

In spite of his arrogance, Mizar does show a level of concern and respect for his fellow Barians, as revealed when he saw Alito injured.<ref name="ep87">{{episode|Yu-Gi-Oh! ZEXAL|87|ref}}</ref> He showed much anger and hatred towards [[Vector]] for his mocking of Alito and Girag and had to be physically restrained by Dumon to prevent him from attacking Vector.<ref name="ep94" /> He also maintains a strong sense of honor, much like Alito, refusing to use "[[Sargasso Lighthouse]]" in his rematch with Kite, calling it a "coward's card".<ref name="ep96">{{episode|Yu-Gi-Oh! ZEXAL|96|ref}}</ref> In his past life, he was fiercely loyal and held a strong friendship with his dragon.<ref name="ep106">{{episode|Yu-Gi-Oh! ZEXAL|106|ref}}</ref> Mizar has also displayed a degree of respect and mercy for his foes as he allowed [[Quinton]] and [[Trey]] to say their goodbyes to Yuma before defeating them and sending them to the Barian World, referring to them as "proud brothers".<ref name="ep128">{{episode|Yu-Gi-Oh! ZEXAL|128|ref}}</ref> Likewise he also mourned Kite's death at the end of their final duel despite their fierce, bitter rivalry.<ref name="ep135" />

When Mizar was a young child, raiders attacked his village and killed everyone, including his parents, and but he was able ran away. He eventually ended up in a desert where he was on the verge of dying until [[Jinlong]] rescued him. The two formed a strong bond.<ref name="ep135">{{episode|Yu-Gi-Oh! ZEXAL|135|ref}}</ref> Since then, Mizar became a mighty dragon tamer who protected his land alongside Jinlong. When a secret agent posing as a wandering [[Wandering shaman|shaman]] blamed the dragon for a deluge that flooded the village, Mizar defended him from the rioting villagers and even offered his life so the villagers would believe him. They were then ambushed by a neighboring army, which killed Mizar and Jinlong and took over the land.<ref name="ep106">{{episode|Yu-Gi-Oh! ZEXAL|106|ref}}</ref> While he lay dying the wandering shaman, revealed to be [[Don Thousand]], appeared, stating he could not let his dragon soul go to the [[Astral World]]. Thousand gave Mizar "[[Number 107: Galaxy-Eyes Tachyon Dragon]]" and filled his heart with hatred.<ref name="ep134">{{episode|Yu-Gi-Oh! ZEXAL|134|ref}}</ref>

When Mizar arrived on the moon, he had a conversation with Kite, who revealed the origin of the "[[Galaxy-Eyes]]" and their connection to the [[Numeron Code]] to him. After the conversation, Mizar commenced [[Barian Battlemorph]] and challenged Kite to a Duel to prove himself as "the strongest Dragon Master".<ref name="ep133">{{episode|Yu-Gi-Oh! ZEXAL|133|ref}}</ref> After "[[Number C107: Neo Galaxy-Eyes Tachyon Dragon]]" and "[[Number 46: Dragluon]]" destroyed each other and [[Jinlong]] revealed his true past life, Mizar reverted back to his human form. He then angrily Battlemorphed back to his Barian form, affirming that he will not believe that "Tachyon Dragon " would betray him and he will defeat Kite.<ref name="ep134">{{episode|Yu-Gi-Oh! ZEXAL|134|ref}}</ref>. Mizar and Kite continued the Duel, with the former brutally assaulting Kite, which caused him and [[Orbital 7 ]] to sustain severe damage. While Kite lay on the ground, exhausted, he made a connection with Yuma, Astral and [[Tori Meadows]] so they could watch the Duel. At this point, Kite and his friends asked Mizar to cease fighting for [[Don Thousand]], who had been manipulating him, but Mizar quickly claimed that he was fighting to protect his fellow Barians. Yuma and Astral told him that there was nobody to protect because Vector betrayed and absorbed most of his companions, while . They also confirming that "Neo Galaxy-Eyes Tachyon Dragon" was Don Thousand's curse upon him, much to Mizar's horror and disbelief. Kite cut the conversation short, claiming he will free Mizar from his curse, and the two resumed their Duel. [[File:MizaelCriesAtKite'sDeath.png|right|200px|thumb|Mizar sobs at this rival's demise.]] Kite brought back "[[Number 62: Galaxy-Eyes Prime Photon Dragon]]" to battle with "Neo Tachyon Dragon". As the monsters clashed, Kite questioned Mizar on why he was a dragon tamer and theorized that he trusted dragons but was incapable of trusting people. Mizar demanded Kite to not take pity on him. Kite quickly claimed it was not pity, but admiration, since he recognized Mizar as the true Dragon Master. Kite further clarified that he just used his "Galaxy-Eyes" because he wanted to protect his family, but his monster allowed him to meet all his friends and trust people. Kite asked Mizar to tell him that the next time they met, to tell him what happened to him. He activated the effect of "Prime Photon Dragon" and defeated Mizar. Mizar witnessed the awakening of "[[Number 100: Numeron Dragon]]" and walked towards Kite, who lay beaten on the ground. Kite gave "Numeron Dragon" to Mizar, asking him to walk the path he believed in, before dying as a result of his injuries. Crying, Mizar mourned for Kite, while swearing and angrily swears revenge on Don Thousand.<ref name="ep135">{{episode|Yu-Gi-Oh! ZEXAL|135|ref}}</ref>