Wouldn’t it be Oppa? Since he is a male? Actually he might not be anything now. I know it sounds grim. But he was a very adventurous person. Some positive, others are questionable. But that is him. Who am I to judge? I am not a holy being. 😂
You only said 'person'. So I wouldn't know gender beyond that. But for other reasons depending on what gender or nonbinary they are, it can go in any direction really. If they're older than you than it would naturally be 'oppa'.
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He uses he/him/his 😊