I think this is very similar to what most Christians ask themselves everyday. What does God look like and what is heaven going to be like? And of course nobody will know until they die. So I think your question has the same answer as this one. Everyone has their own opinion of what God looks like and what heaven is like. So I think that different people would have had different opinions on what Eru looks like.
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King of the Dead: The dead do not suffer the living to pass.
Aragorn: You will suffer me.
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