|Koon Aguero Agnis|
|Korean Name||쿤 아게로 아그니스|
Koon's Team (former)
|First Appearance||Vol.1 Chapter 5|
Aguero has angular, cobalt blue eyes; ultramarine in the first part, and a deeper cobalt in the second part. He has silvery, blue hair (as is the norm for those from the Koon Family) that reaches his shoulders. His bangs cut across his forehead and hang just over his eyebrows. On occasion, he sometimes puts his hair up in a small ponytail.
He's got a small build but somehow still muscular. Several characters remark him as good-looking or handsome (even SIU says so in FAQ).
As a member of the Koon Family, Koon's complexion is paler than most characters in the series, taking on somewhat of a whitish, desaturated blue.
Koon's bangs are more side sweep, and his eyes are more ultramarine than cobalt. His hair is notably shorter and sticks out more than the second half. He wears a blue bandanna tucked inside his hair. (It is occasionally used to tie up his hair. In the Crown Game arc, he used it as a signal for assistance.) He wears a white shirt, black tie and carries Manbarondenna, a special briefcase. He sometimes wears earrings. In the beginning his features used to be skinny and his face used to be angular, but this was changed sometime around the Rest arc.
In Part II, Koon was introduced with a Safari get-up and shorts. His hair was also aquamarine, something that was corrected in the next chapter. His eyes were desaturated to a lighter blue than before, and can even be seen as electric blue in certain chapters. His clothes are inconsistent and vary with each arc. Sometimes he wears a shirt, like in the Floor of Test, and sometimes he wears T-shirts. In the Devil of the Right Arm arc he wore a brown cloak with his father's armour underneath.
PersonalityKoon is depicted in the series as a cool-headed and highly intellectual character, often the schemer of the group. He is also rather smug when his plans work. He was able to amaze even the Rankers with his planning during the Hide-and-Seek game, and has been described as "a dangerous being". He is skilled in his manipulation of others, and has the mindset of "a ruler". He doesn't seem to be the type of person to follow the rules of others. He is rather friendly most of the time, but can be extremely ruthless and is not above using others. He can also be rather playful while toying with people and finds great entertainment in seeing his results. This stems from a desire to be a child, since he didn't have the chance growing up in the political battle field of the Koon Family. He is quite bold, having stolen goods from Koon Eduan's treasure chambers.
Despite being ruthless, Koon is a very sensitive person. He is definitely more human than most characters in the series (as mentioned by SIU in an interview). He shows extreme care and caution, particularly in matters involving Baam and Baam's safety. Koon seems to have a somewhat guarded personality (as shown in the Floor of Tests during the Door Test) and doesn't trust others to complete tasks, and instead takes the burden all for himself. He might show signs of sociopathy, but there is a lot about his past we don't yet know that might have created the guards he has forged around himself.
Early on in life, he struck a friendship with a half-sibling Maria, and was drawn to her kindness amidst the plotting and political warring that went on throughout the family. Once she was gone, he felt empty, and it was implied that what he lost was friendship and passion, and through his observation and participation with Baam and Rachel's life, he thought he could obtain this. In a way, this was what Rak had touched on: that he had lost his drive, or more accurately, his 'banana'.
Even though he hides it, he cares very deeply for the things he finds precious. He is willing to sacrifice himself and put himself at risk and in isolation to protect those he cherishes. He admitted to Ja Wangnan that if he came across a jewel he treasured, he would hide it as well as he could so others couldn't get to it, even if it meant that he could never see or wear it. Similarly, when he met Baam and decided to climb up with him, he resolved to do whatever it took to put him on the top of the Tower; and when he came across Maria, he resolved to put her in the best place possible, even if it meant he could never see her again.