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Kawasumi Itsuki is the Bow Hero and one of the four holy hero summoned in Melromarc
Being a bullied child has left Itsuki with a desire to be special and superior, his sense of justice and need for praise both stem from this, as does his inability to deal with the meek Rishia, who reminds him of his weakness.Like the other three heroes he believed the world they had come into was a game, but he goes further than they do and believes Naofumi has met god I.e. the game master, and received powers from him to explain his superiority. Even after becoming a yes man and having everything shattered, he still feels Rishia being stronger than him has to be a cheat. Like the other heroes he thought he was immortal as well, since the "game" wouldn't let them die.
He called himself an ally of justice and tried to act on it, at-least as fairly at the beginning but he lost the true essence of justice and acted on his own selfish reason under the guise of justice.His sense of justice is so encompassing that he refuses to listen what anyone had to say and believed his own to be true and just. Under the influence of the Curse Series Itsuki wishes to bring everyone in the world to understand him and his justice, via brainwashing arrows, and goes completely off kilter, trying to outright kill Rishia when she said his stance on justice was utterly mistaken, not willing to listen to her and calling everything againt his belief as evil.
Though he goes on about justice on a regular bases, his view of it is incredibly self-indulgent and one sided. As Naofumi and later Rishia both put it Itsuki's justice is not the same as someone else's justice, and there are as many types of justice in the world as their are people. He was willing to put the evil doers to death if he believes so, and was willing to Kill Nafoumi when the later was charged with kidnap accusation and doesn't mind of killing some one, if he considers them to be evil though it may not be true.
He can also be quite gullible and stupid, though not to Motoyasu's extent, as all of his teammates excluding Rishia are in fact extremely untrustworthy people who just praise him all the time.They just fed his desire to be praised and every-time he felt satisfied by their praise.He's even willing to conceal his power form allies and wait for them to actually be in danger before he'll step in so he can impress them.
He feels in his own mind that he's the strongest of the heroes, and he undergoes stealthy missions to kill corrupt nobles and save villages almost always just for the praise. He's extremely petty, and not very smart, believing Naofumi is guilty on both the false rape charge and later believing the Nafoumi of steeling his credit for his achievements, which basically isn't hard for anyone to do because Itsuki pretends to be a robbin-hood-esk Hero who conceals his own activities often.His pettiness was once again exposed, when Rishia was praised over him for her effort against L'Arc. For which he framed Rishia of breaking an item and kicked her out, as she was praised over him.
Then again he can be easily fooled, like he was by the church of three heroes for all their lies about Nafoumi and also by Nafoumi's scam of an item that supposedly had the power to raise his EXP intake. After awakening his curse series, He believes Naofumi is evil for taking slaves and turning away people who he could supposedly revive from the dead, because Malty tricked him into thinking the latter was possible.
In short, he's stuck up, gullible, and wants to be praised by others. The one thing Naofumi has ever said to him that has genuinely enraged Itsuki is in fact as simple as "i thought you were better than this, my evaluation of you has dropped," to which he was willing to shoot the Shield Hero in the back of the head for it.
Though his appearance is younger, he was actually 17 at age. He has a naturally a curly hair that flopped. He is blonde hair which makes him charming.
He vanquishes those he sees as evildoers without thinking of the consequences of his actions. He likes to wait until people are in a crisis before acting so he can "save" them in a heroic fashion, going far enough to lie about his abilities to cover up his inaction before people fall into critical situations.
Itsuki looked down on Naofumi considering him to have the weak weapon. As easily gullible person, he believed Malty's accusation of Nafoumi raping her and berated Nafoumi without hearing or believing his side of the story. He believes Nafoumi to be an evil person and readily accepted any accusation made against him, such as that of Nafoumi brainwashing the people and kidnapping the second princess without doing any background check to those claims. He readily believed Nafoumi stealing his achievement without any leads or evidence and still tried to stand on it when proven otherwise.
After Nafoumi's name was cleared, he agreed to the queen's idea of giving little preferential treatment to Nafoumi, in-order to balance all the past misdeed against Nafoumi, but Nafoumi felt it to be just for say from Itsuki and was sure that he would throw a tantrum.Itsuki doesn't like the idea of being inferior to Nafoumi(A weak job in his eyes) and felt him to be bossing him & other heroes. He openly stated to Nafoumi of outshining him. This leads his involvement in the spirit tortoise incident.
Like wise, Nafoumi didn't view Itsuki in good light for he seen though Itsuki as a self centered, approval seeking person. However, what little respect he had for Itsuki completely disappears when Itsuki kicks Rishia out of his party for being weak.
Despite all, Itsuki stood up for Nafoumi for the rigged duel with Motoyasu and Melty's involvement in it. He also demanded the reason for revoking Nafoumi's payment as he didn't get any job from the guild to support himself. Nafoumi also defend Itsuki from Raphtalia's criticisms by stating that Itsuki was stuck up, but would never let harm befall his allies.
Itsuki along with Ren and Motoyasu fights wave boss, they even team up against Nafoumi when the later was accused of kidnapping the second princess. Though he firmly believes Nafoumi to be a villan, Itsuki lends ears to Ren for to investigate the back story of the kidnapping incident, to see if Nafoumi was really telling the truth.This shows a certain degree of companionship between them. Despite fighting along side, Itsuki was just as surprised as Nafoumi after leaning Ren's way of working with his comrades.
Itsuki was little envious of Motoyasu's preferential treatment. Itsuki along with Ren and Motayasu fought waves and final boss.Itsuki along with Ren called out Motoyasu of his rigged duel with Nafoumi.Motoyasu considered Ituski and Ren as his buddies and went on rampage against Nafoumi, after falsely informed of Nafoumi involved in killing them. Later, he joins with Naoumi to fight against Pope for the same reason and vows to avenge them and give them proper funeral, but was surprised of them being alive.
Glass defeats Itsuki with much ease, believing him to be a normal adventure and wonders where the other heroes were. While She acknowledging Nafoumi alone to be a hero
Itsuki rescued Rishia from an evil Nobel men. From then on Rishia follows Itsuki to a letter, though she was mostly mistreated by her fellow peers. Rishia mostly reminded Itsuki of himself from his original world and tried to bury it.Itsuki and his comrades forced her to use her weak points rather than sharpening her strong skills.Itsuki finally snapped when Rishia received the praise of the queen for being useful in handling L'arc while he wasn't. He framed her and kicked her out.When questioned by Nafoumi, he replied her being weak and did it for her own good, which pushed her to commit suicide. Later, Risha grown strong under Nafoumi.