キム・サンジン氏は「今回、首席キャラクターデザインも韓国人のキム・シユン氏（３１）がつとめた。彼の提案で、作品に登場する“ビッグ・ヒーロー６”の一員『ゴーゴー』は初めから韓国人と設定してデザインした」と付け加えた。

https://s.japanese.joins.com/JArticle/195347?sectcode=420&servcode=400

明確に韓国系とされたgogo以外のキャラクターはというと…

In the Korean version, “Hiro,” a Japanese boy’s name, is “Hero.” What’s more, his last name is no longer the Japanese surname “Hamada,” but “Armada.” His brother, “Tadashi,” is called “Teddy,” because “Tadashi” is a Japanese name—even if, as noted by tipster Sang, the character’s original English-language voice actor is a half-Korean actor. Basically, explicit indications that the characters were of Japanese heritage were nixed for Korean audiences.

https://kotaku.com/why-big-hero-6-is-upsetting-some-people-in-south-korea-1680370861

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a half-Korean actor（アイルランド-韓国系アメリカ人）→the character’s original English-language voice actor（声優）

「Daniel Henney participated in the dubbing of the animation ‘Big Hero’.

Daniel Henney attended a press conference in Korea for the movie ‘Big Hero’ held at the Conrad Hotel in Yeouido, Seoul on the 14th.  In the animation ‘Big Hero’, he acted as the voice of Teddy, the older brother of the main character, a genius engineer.

At the press conference that day, Daniel Henney said, “Acting in animation dubbing was a big challenge for me.”  He said, “Dubbing acting was a really difficult challenge for me.  The voice actors look great,” he said.

https://www.joongang.co.kr/article/16935674　」

「Also present at the conference were Kim Sang-jin, the character design supervisor for the film, and Daniel Henney, a Korean-American actor who performed the voice-over for one of the main characters.

Kim, the first Korean to become the top animator at Walt Disney Studios, revealed that the lead characters, although they were later given Japanese names, were originally envisioned as Koreans.

Kim, the first Korean to become the top animator at Walt Disney Studios, revealed that the lead characters, although they were later given Japanese names, were originally envisioned as Koreans.
“Early designs were drafted by Kim Shiyoon, a fellow Korean animator, who originally created the characters as Korean. Of course, there are no mentions of specific nationalities in the film, but that was what we, the artists, imagined,” Kim said.

https://www.koreaherald.com/view.php?ud=20150115000929　」

韓国人初のディズニーアニメーションのキャラクターデザインスーパーバイザーをつとめたキム・サンジン氏（５５）氏の話だ。製作過程で彼はキャラクターデザイン作業とコンピュータグラフィック（ＣＧ）の部分をつなげる作業を総括した。キム・シユン氏（３１）…の提案で、作品に登場する“ビッグ・ヒーロー６”の一員『ゴーゴー』は初めから韓国人と設定してデザインした。

混乱の原因が分かってきましたｗｗｗ　コリアヘラルドと中央日報と同じはずなのに、

キム・シユン氏がゴーゴーは韓国人と設定した部分以外は、キャラクターのモデルについて意見が異なっています。

「    “Yes, I really would.??I have watched many of them and do love them.
    Mr. Koreeda sent me an email three years ago about the conversation between him and one of the designers of Disney in LA.??The designer told Mr. Koreeda that?the?design of?the boy character in “Big Hero 6” was inspired by?the role I played in “Nobody Knows” (Daremo Shiranai).
    I was so impressed when I read the email.
    Disney has been very special to me, and it was my great pleasure to work for Disney+ Hotstar and meet Micky Mouse this time.??I think I am just lucky.
    I do want to play in a Marvel movie!”

https://www.kakuchopurei.com/2022/12/gannibal-actor-reveals-that-he-was-the-inspiration-for-the-design-of-this-marvel-character/　」

the characters were of Japanese heritage　←大爆笑

キム・シユンさん、いい仕事しすぎでしょうｗｗｗ