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The kanji looks alright, I might change a few to less common usages (or maybe katakana), but that's just personal preference.

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I like both 飛鳥 and 朝日 for Asuka

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For Rin I like 李 or 鈴 for females and 梨 or 燐 for males

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Megumi I prefer 恵 even if it's obvious I like the meaning

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Hikaru I would leave as is because of how iconic it is