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{{For|the manga version other versions of this character|Haruto Hart Tenjo (mangadisambiguation)}}

| favorite food favorite_food =

| appears_in_manga = [[Yu-Gi-Oh! ZEXAL (manga)|Yu-Gi-Oh! ZEXAL]]| appears_in_anime = ''[[Yu-Gi-Oh! ZEXAL]]|[[Yu-Gi-Oh! ZEXAL II]]''

| en_voie en_voice = {{voice actors|en|Bella HudsonRebecca Soler|e1=(credited as Jessica Paquet)}}| it_voice = {{voice actors|it|Federica Valenti}}

'''Hart Tenjo''', known as '''Haruto Tenjo''' (天城ハルト, ''Tenjō Haruto'') in the Japanese version, is [[Kite Tenjo]]'s younger brother and younger son of [[Dr. Faker]]. He possesses abilities from the [[Barian World]], that Dr. Faker abuses in order to accomplish his plan of destroying the [[Astral World]], and collecting the "[[Number]]" cards. He holds a strong connection to [[Yuma Tsukumo]] and [[Astral]].

While under the influence of his [[Vector|Vector's]] Barian powers, Hart suffers from a split personality: that of a sadistically sadistic nature with a desire to destroy the Astral World, as seen when he's laughing at the Astral World's its inhabitants' suffering, saying that he "needs more screams" (in the dub he says he needs more energy), as that is what comforts him.<ref name="ep13">{{episode|Yu-Gi-Oh! ZEXAL|13|ref}}</ref> When he's not using his powers, he tends to act quite vulnerable, usually staying in bed, or looking down at [[Heartland City]] from the [[Heartland Tower]], wondering why he cannot enjoy laughter like the people who attend the Heartland Fairground.

Before Hart went to live in Heartland and after he got better he was a regular kid, who loved to play and have fun. He has a very kind personality and is always trying to look out for others,especially Kite had stated .In the anime Kite states that Hart has not been his usual self as in the past, as he used to enjoy laughter and was playful and talkative and was very kind.<ref name="ep22">{{episode|Yu-Gi-Oh! ZEXAL|22|ref}}</ref>

During the duel Duel when Dr. Faker is possessed by [[Vector]], he was shown to deeply care for Kite and Yuma, as he could not bear to see them in pain and shedding tears.<ref name="ep71">{{episode|Yu-Gi-Oh! ZEXAL|71|ref}}</ref> After the duel Duel with Vector, Hart was fully rid of the Barian's influence (with his the blank stare and bags under his eyes gone) and his personality reverted to the way it was in the past.<ref name="ep72">{{episode|Yu-Gi-Oh! ZEXAL|72|ref}}</ref> ===Etymology===Although he is fragile, his dub name is the German word for "tough" or "strong".

Hart fully used up drained his powers to free emancipate [[Astral]] from the [[Sphere Field|Sphere Field Cannon]].<ref name="ep71">{{episode|Yu-Gi-Oh! ZEXAL|71|ref}}</ref> ===Etymology===Although he is fragile, his dub name is the German word for "tough" or "strong".

During one night at [[Heartland]], Kite tried to escape with Hart. As they were hiding from Heartland Police, Kite gave him his favorite candy, a piece of caramel to cheer him up. However, they were found soon. Kite was subdued, while Hart was taken away from him. Seeing his brother being restrained, Hart used his powers to knock the police who were guiding him off of the tower. But they were both captured once more.<ref name="ep40">{{episode|Yu-Gi-Oh! ZEXAL|40|ref}}</ref>

[[File:Hart's Power.jpg|thumb|right|200px|Hart's Dark Energypowers throw [[Yuma Tsukumo|Yuma]] and [[Tori Meadows|Tori]] back.]]

[[File:HarutoprotectsKaitoHartProtectsKite.jpgpng|left|200px|thumb|Hart saves his brother.]]

When Vetrix released all the souls of his victims, Hart is shown to be waking up from his coma along with Kite.<ref name="ep67">{{episode|Yu-Gi-Oh! ZEXAL|67|ref}}</ref> However, Dr. Faker took Hart and used him to power the [[Sphere Field#Sphere Field Cannon|Sphere Field Cannon]].<ref name="ep68">{{episode|Yu-Gi-Oh! ZEXAL|68|ref}}</ref> Kite teamed up with Yuma and [[Reginald Kastle|Shark]] and attempted to defeat Faker and save Hart.<ref name="ep69">{{episode|Yu-Gi-Oh! ZEXAL|69|ref}}</ref> Faker eventually revealed the truth of his deal with [[Vector]], saying that Hart would not have survived up to that point without the power of the [[Barian World]].<ref name="ep70" /> Hart managed to use his powers to free Astral from the Sphere Field, letting him [[ZEXAL (power)|merge]] with Yuma and win the Duel, saving Faker from Vector's possession.<ref name="ep71">{{episode|Yu-Gi-Oh! ZEXAL|71|ref}}</ref> After Fakers defeat, he alongside his father watched the Duel between Yuma and [[Kite Tenjo|Kite]].<ref name="ep72">{{episode|Yu-Gi-Oh! ZEXAL|72|ref}}</ref><ref name="ep73">{{episode|Yu-Gi-Oh! ZEXAL|73|ref}}</ref> ===Yu-Gi-Oh! ZEXAL II===After hearing that Yuma was hospitalized, Hart admonished Kite about visiting Yuma in the hospital instead of looking over data about [[Mizar]]. When Kite seemed to ignored him, he decided to go on his own until [[Orbital 7]] warned Kite on how it was time to visit Yuma like he planned too, causing Hart to smile.<ref name="ep84">{{episode|Yu-Gi-Oh! ZEXAL|84|ref}}</ref> On the night before Kite goes to the [[Barian World]] to help Yuma, Kite informed Hart of his mission, causing Hart apologized and blamed himself for causing Kite to go on a dangerous mission on his behalf. However, Kite insisted he going of his own choice and promised Hart that he will to return soon.<ref name="ep95">{{episode|Yu-Gi-Oh! ZEXAL|95|ref}}</ref> [[File:Faker_and_Hart_Watch_The_Duel_on_The_moon.png|thumb|left|190px|Dr. Faker and Hart watching Kite's Duel]] During the [[Barian]]s' invasion of [[Earth]], Dr. Faker and Hart watched Kite's and [[Mizar]]'s Duel on the moon from their laboratory.<ref name="ep134">{{episode|Yu-Gi-Oh! ZEXAL|134|ref}}</ref> As Kite was about to die, he comforted his saddened family by saying he had no regrets and told Hart to care of their father before the screens blacked out.<ref name="ep135">{{episode|Yu-Gi-Oh! ZEXAL|135|ref}}</ref> After the fusion of the [[Barian World]] and Earth continued, Faker and Hart used [[Heartland Tower]] to house survivors who did not obtain a "[[Fake Number]]" and get sacrificed to the Barian World. As most of the people started to lose hope, Hart urged not to because Yuma was fighting for them.<ref name="ep142">{{episode|Yu-Gi-Oh! ZEXAL|142|ref}}</ref> After [[Nash]] was defeated by Yuma and saved the Earth, Hart went with [[Caswell Francis]], [[Cathy Katherine]], and [[Lillybot]] to congratulation Yuma's success. However, Yuma regretfully informed to Hart that he couldn't saved Kite.<ref name="ep144">{{episode|Yu-Gi-Oh! ZEXAL|144|ref}}</ref> Some time after Yuma's and Astral's Duel, Hart started assisting with his father, [[Vetrix]], [[Quinton]] and a revived Kite to research parallel worlds.<ref name="ep146">{{episode|Yu-Gi-Oh! ZEXAL|146|ref}}</ref>

[[Kite Tenjo|Kite]] loves his little brother Hart, very much and he claims Hart is "everything" to him. In their childhood, Kite and Hart lived together mostly by themselves and would play every day, from catching butterflies to playing hide-and-seek. Kite would do anything it took to protect Hart, even at the cost of his own life, pushing himself to hunt "Numbers" on his own and disregarding the dangers of his [[Photon Transformation]].<ref name="ep50">{{episode|Yu-Gi-Oh! ZEXAL|50|ref}}</ref>

While Kite is normally cold and detached from others, Hart brings out Kite's gentle and caring side. Since Hart's "sickness" took a toll on him, Kite often tried to make him feel better, usually having a limited success. Kite also tried to spare Hart from being concerned about him, putting on a forced smile and assuring him that he's alright. Although he goes along with Kite's words, Hart can see through him and understands what Kite was doing for him. If he was able to, Hart would try to protect Kite as best as he can within his powers.<ref name="ep13" /><ref name="ep14" /><ref name="ep22" /><ref name="ep40" /><ref name="ep43" /><ref name="ep54">{{episode|Yu-Gi-Oh! ZEXAL|44|ref}}</ref><ref name="ep56">{{episode|Yu-Gi-Oh! ZEXAL|56|ref}}</ref>

While Hart was having a power surge, Yuma ran into the explosion and hugged Hart, telling him "you're not alone" and promised to bring him to his brother. Also, Yuma helped Kite rescue Hart from the [[Vetrix Family]], and showed great concern when Hart was found unconscious.<ref name="ep40"/> Yuma seems to have grown close to Hart; while speaking to him in his mind, Hart asked Yuma and Astral to save his brother, Kite.<ref name="ep60"/> When Vetrix used his connection to Hart to hurt Kite, Yuma rushed to [[Heartland Tower]] to save him and severed his link to Vetrix.<ref name="ep63" /><ref name="ep64" /> Likewise, Hart also cares deeply about Yuma as he is always doing things for his sake.<ref name="ep71" /> Hart is also grateful towards Yuma for helping his brother overcome his guilt.<ref name="ep72" /> <ref name="ep73">{{episode|Yu-Gi-Oh! ZEXAL|73|ref}}</ref>When Hart heard that Yuma was injured, Hart was very concerned about him and wanted to visit him at the hospital, even wanting to see Yuma on his own if Kite didn't go with him.<ref name="ep84">{{episode|Yu-Gi-Oh! ZEXAL|84|ref}}</ref>