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You've definitely created a diverse group but I don't think that's what you meant by unique. I can't tell either way from the descriptions you've given, but the characters need to have more to the...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/41194 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
You've definitely created a diverse group but I don't think that's what you meant by unique. I can't tell either way from the descriptions you've given, but the characters need to have more to their personality, skills, and flaws than just their race and sexuality. If Podia is just the a regurgitation of what you read on a Japanese-English culture Facebook page, they won't seem unique from any other Japanese-English teenager. While culture can play a moderate to large parts of one's childhood, their are several other factors and influences that make people unique. Lastly, make sure your characters have conflict and evolve as a result over the course of the story; while a character's temperament at any given point in the story shows how unique they are or are not, the way they change in response to conflict does so just as well and keeps characters from ever feeling stale. For example, I live in Canada and know a few Russians and they tend to be more conservative. Without making him a malicious prejudiced jerk, Felix could lack the understanding of Jackson's sexuality, causing them to but heads at the beginning of the story, but allowing you to develop them to understand and respect each other as the story comes to a close.