Question

Explain "he is every man in no man"

Answer 1

This line is taken from the play merchant of venice
It means that the person being referred to as the character of everyone in this world but does not have his own character

Answer 2

here's the meaning

Portia is talking about the French lord and suitor Monsieur le Bon. Portia says that he constantly tries to look better than than every other man that he scarcely has a personality of his own hence the term, he is every man in no man.