noun
invisible person
Refers to a person who cannot be seen, typically in science fiction, fantasy, or metaphorical contexts. The classic example is H.G. Wells' 'The Invisible Man'.
透明人間になれたら、何をしたいですか？
If you could become an invisible person, what would you want to do?
彼はまるで透明人間のように、誰
He went unnoticed by everyone, as if he were an invisible man.