Julia Krystal Julia Krystal , known as Masumi Kotsu ( " Kōtsu Masumi " ) in the Japanese version , is a character in the " Yu - Gi - Oh ! ARC - V " anime and is the representative for the Leo Institute of Dueling Fusion Summon course . Design . Appearance . Julia is a teenage girl with dark skin tone , shoulder - length black hair and red eyes . She wears a small blue shirt with her LID badge pinned on it over a cream one - piece long - sleeved shirt and shorts combination with black skin - tight shorts underneath ending above the knee , and blue boots . She carries her Duel Disk in a brown holster resembling that for a firearm . Etymology . Masumi means " beauty " and " purity " , most likely referring to her affinity of jewels , her father ' s occupation and her Deck . Her first localized name sounds similar to " jewel " , and her English surname is a corruption of " crystal " . Personality . Julia is a direct , straightforward and bold individual , showing little to no hesitation in saying what she believes . Due to her father ' s job and witnessing and appraising the value of jewels , she is seemingly capable of detecting talent and hesitation within people , as she did with Zuzu at the start of their Duel . Although Julia shows a penchant for mockery , most of what she states is accurate thus , she does not act out of plain arrogance but on observation . She was not easily fooled , as seen when LID Elites lied about Professor Marco being hurt in his Duel , and she was thus willing to seek the truth . Despite her bold exterior , she was visibly unnerved during her first meeting with Shay and when she saw the gouges that his monster had left in an overhanging road . Julia is also a caring person , valuing her friends and her teachers , and after Professor Marco ' s disappearance , she became frantic in her attempts to find him . She cares for ( and possibly has a crush ) on Marco particularly , and doesn ' t tolerate insults towards him . Biography . Pre - Arc League Championship . Julia , Dipper , and Kit were enlisted by Henrietta to Duel members of the You Show Duel School in retaliation for the apparent attack on Sylvio . After Dipper was defeated by Yuya Sakaki , Julia went next , matched up against Zuzu Boyle . Before the Duel , Julia noted that Zuzu ' s eyes had no shine to them , much to Zuzu ' s irritation . She brought out " Gem - Knight Topaz " on her first turn , but took a large amount of damage from Zuzu ' s " Melodious " monsters . On her next turn , however , reiterating her comments on Zuzu ' s lack of brilliance , she brought out both " Gem - Knight Crystal " and " Gem - Knight Master Diamond , " using the effects of the latter to set up an OTK . Zuzu attempted to use an Action Card to stop the second attack of " Master Diamond , " but by accident instead touched a reflection , and Julia ' s attack went through , winning her the Duel and putting the score even at 1 - 1 . She commented on Yuya and Zuzu ' s embrace after the Duel , prompting Zuzu ' s swift breaking up of the situation . Kit went next , Dueling Gong and claiming to be far stronger than " those weaklings , " which infuriated Dipper . Julia admitted that the comment was annoying , but Dipper had lost , after all , prompting an embarrassed Dipper to sulk in the corner . During Kit ' s Duel , Dipper commented that an " X - Saber " Deck was terrifying to face . Julia asked him if it was because he ' d lost that he was admitting that , once again causing Dipper to retreat to the corner in shame . After Kit and Gong drew the Duel , Henrietta proposed a tie - breaker Duel between those who had won ; Yuya and Julia . Julia was ready to Duel , but they were interrupted by Declan . She watched the Duel and called Dipper and Kit clowns for mocking Yusho Sakaki . Upon learning that her Fusion teacher , Marco , had been in an incident , Julia became frantic about him . Unconvinced by Herk ' s reassurances that the LID Elites would resolve the issue , she continued pursuing the culprit , arriving at the warehouse where Zuzu , Sora , and the Dark Duelist were . Immediately accusing the Dark Duelist for the attacks , she demanded a Duel from him . However , before the situation could progress any further , he was teleported away by the ability of Zuzu ' s bracelet , infuriating Julia and causing her to accuse Yuya , who had just arrived , of being in cahoots . She dashed off after Sora tricked her into thinking he had run past , while pushing Yuya away . Still upset by her teacher ' s disappearance , Julia resolved to lure out the Dark Duelist and ran off , much to Kit and Dipper ' s protests . On her way to the warehouse , she noticed the two marks left by Shay ' s monster , much to her horror . Once she found Zuzu and Sora , Julia demanded a Duel from Zuzu , who hesitated to do so . Before they could initiate the Duel , Shay dashed in and pushed Zuzu over , demanding that Julia Duel him as a member of LID . She identified him as the culprit from this statement , but could not bring herself to Duel him . At that moment , the Dark Duelist , Yuto arrived , surprising her , Zuzu , and Sora . As Yuto squabbled with Shay , Julia contacted Kit and Dipper , telling them that she had found the culprits , and to bring as many men as they could . After Zuzu protested , Julia watched quietly as Shay mistook Zuzu for Lulu , and Yuto knocked him unconscious as a result . Just as Kit and Dipper arrived with Yuya in tow , both Yuto and Shay teleported away via Zuzu ' s bracelet , causing to her remark fully that the culprit had escaped . When men from LID arrived , Julia ran towards them , apologizing and saying the culprit had gotten away . She set herself up as bait on purpose to draw out Shay , as did Dipper and Kit . Shay approached her during the evening , asking her if she was alone and where Sora and Zuzu were , Julia claimed that she didn ' t know ( though unbeknownst to her , Zuzu had seen her earlier and pursued her ) . She asked him what had happened to Marco , but Shay was initially unsure of who she was referring to , only realizing it when she explained that he was a Fusion user . Shay called Marco and everyone from LID weak , telling an insulted Julia to sate her rage by defeating him . She called in Kit and Dipper , explaining that she ' d been set up as bait as she knew what Shay looked like . When her friends arrived , Shay took them all on in a Battle Royale , with Julia going first . Kit and Dipper cleared Shay ' s field and hand with their " X - Saber " Synchro and " Constellar " Xyz Monster s , leaving Julia to take out his Life Points . She set up a combination of " Gem - Knight Lady Lapis Lazuli " and " Gem - Knight Master Diamond " that would deplete Shay ' s Life Points through sheer effect damage , but Shay saved himself with his " Raidraptor - Readiness " Trap Card that he ' d activated from his Graveyard , also preventing any battle damage on the turn as well . Shay claimed that their Dueling lacked iron determination and a sense of strength , and he drew " Dimension Xyz , " using it to call out his " Raidraptor - Rise Falcon , " which gained the combined ATK of all of the trio ' s Special Summon ed monsters and attacked them , wiping them out in an instant . Shay didn ' t take their souls as he had the other LID members that he ' d attacked , as Declan had arrived by then . Julia ' s memory was wiped of the Duel and rewritten to believe that Shay had been a member of LID . Arc League Championship . At the Junior Arc League Championship , Julia ' s first match was against Zuzu in the afternoon . Zuzu asked Julia why Shay was among them , and a confused Julia replied that Shay had always been part of their group . Noticing that Zuzu was preoccupied before the Duel , Julia commented that Zuzu ' s eyes held no luster . On her first turn , Julia brought out " Gem - Knight Master Diamond " against Zuzu , who responded by revealing that she had learned to Fusion Summon , bringing out " Schuberta the Melodious Maestra " to not only destroy " Master Diamond , " but also to prevent Julia from recovering her " Gem - Knight Fusion " on the next turn . Julia managed to climb back into the game by using " Brilliant Fusion " to call out her true ace monster , " Gem - Knight Lady Brilliant Diamond " . In order to keep its ATK up , Julia had to use Action Card s to pay the cost , consistently beating Zuzu to them . She reduced Zuzu to 100 LP , but Zuzu had read through Julia ' s strategy of using Fusion Monster s to take control of Julia ' s " Crystal Rose " , which Zuzu used in the next turn to aid in Fusion Summoning " Bloom Diva the Melodious Choir " . When her " Gem - Knight Zirconia " was destroyed , Julia tried to use " Brilliant Spark " to finish Zuzu off , and discard an Action Card to prevent its activation , but Zuzu beat her to the card and finished Julia off . " Bloom Diva " saved Julia from a nasty fall , much to her embarrassment . Julia later approached Zuzu outside the stadium and gave her " Crystal Rose " , telling Zuzu that she wouldn ' t accept her losing in the tournament . On the second day , she watched the Duels involving Gong , Yuya , Sylivio , and Shay . She commented to Kit that his disciple was doing terrible , though she was impressed when Gong won . During Sylvio ' s Duel with Yuya , Julia was impressed at Sylvio ' s tactics , though she and her friends all expressed disdain at him . When Sora claimed that he was performing a real Fusion Summon , Julia was offended , thinking that Sora was calling an LID Fusion Summon a fake . Later , while Shay was talking about his home , Kit , Dipper , and Julia were confused that they " knew " Shay for so long , but didn ' t know where he was from . After Sora underestimated " Raidraptor - Rise Falcon " , she and her friends commented that he ' d be regretting doing so . She was impressed when Shay demonstrated his capability to Rank - Up his Xyz Monster s . Julia watched her friends ' first round Duels ; Dipper winning and moving onto the second round , but Kit being eliminated and physically beaten by Iggy Arlo . Friendship Cup . Julia and a recovered Kit were present in the stands during the Battle Royal . When Henrietta revealed to the public the existence and MO of Duel Academy , she and Kit realized that this was the likely reason for Dipper ' s disappearance . Declan ' s announcement that LID would be training the Lancers prompted both Julia and Kit to consider joining . Duel Academy . After Zarc ' s defeat and the Standard Dimension being reborn into the " Pendulum Dimension " , Julia had lost her memories of Zuzu and the events involving people from other dimensions . She was present during the Battle Royal with Dipper and Kit . She was later seen watching Yuya ' s Duel against Jack Atlas with Dipper and Kit and applauded when Yuya won . She then watched Yuya and Declan ' s Action Duel . She was happy when Yuya won the Duel and witnessed Zuzu ' s revival . Relationships . Dipper O ' Rion and Kit Blade . She and the boys hang out a lot . They care for each other , but Julia is occasionally annoyed by Dipper ' s pride . She taunted Dipper about his loss to Yuya several times , causing him to slink into the corner . However , when Dipper was sealed into a card , she and Kit considered training to become Lancers . Professor Marco . Julia cares very deeply for her Fusion teacher . She stated that he was always there for her , and she tried hard to rescue Marco from the hands of Shay . Julia was insulted when Shay called him " weak . " Zuzu Boyle . Julia initially showed horrible disrespect to Zuzu , once calling her responsible for Marco ' s disappearance . Julia initially mocked Zuzu ' s Dueling skills , but apologized for her behavior . Overtime , Julia came to respect Zuzu as a rival , and the two of them developed a more friendly relationship . Deck . Julia uses a " Gem - Knight " Deck , which focuses on Fusion Summon ing , spearheaded by her ace monster , " Gem - Knight Master Diamond " , which is later replaced by " Gem - Knight Lady Brilliant Diamond " . She chose to use a Gem - Knight Deck because of her father ’ s occupation as a jeweler . She usually attempts to perform an OTK with " Master Diamond " by copying the effect of " Gem - Knight Topaz " or " Gem - Knight Lady Lapis Lazuli " , which along with " Brilliant Spark " , can inflict large amounts of damage to her opponent . She later utilizes cards such as " Brilliant Fusion " and " Crystal Rose " to easily Fusion Summon her " Gem - Knight " Fusion Monsters , and even Summon them with a single material through " Brilliant Diamond " , focusing on overwhelming her opponents with an array of strong monsters . She uses Action Cards to mitigate the effect of " Brilliant Fusion " so as to not lose offensive power .