Paper Man

1) A person who acts all high and mighty, but is actually weak-willed and pathetic in reality.
2) A sorry excuse for a man, one who acts smug and in-control, but is actually a wet napkin.
3) A fake person, when put under pressure or are called out they seem to crumble.

Don't listen to him, he is a paper man through and through

Greg thinks he's king of the world, but everyone knows he's actually a paper man