How do I write a dead person?

I in the middle of doing a rp on discord and writing a story on wattpad and I gotten to the parts where I have to explain everything with like one or two more arcs and I feel like this is every writer worst nightmare when one of the main characters along with 3 other characters hype someone up to be perfect and basically setting up the events that play out during the story you feel like you have to basically make them a mary sue and my mind keep going to them not being as perfect as everyone in story them out to be throughout the story... I kinda at a with what I want to write and what my brain telling me to write. What should I do?

How do I write a dead person?
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