The Straw Man represents that fictional ALL CAPS legal fiction —The PERSON. He wanted a brain but got a Certificate — The Birth Certificate.
The Tin Man — The TIN (Taxpayer Identification Number). He was a robotic avatar, who worked tirelessly until his body literally froze up & stopped functioning. The heartless & emotionless robot creature who worked himself to death because he had no heart or soul.
The Cowardly Lion was a bully, but was actually a true coward when someone stood up to him, like most bullies. He lacked true courage and in the end, the Wizard gave him an Official Recognition Award — Authority & Status.
The Wizard of Oz used magic, smoke, flames & holograms, but all of it were tricks & illusions to push fear & compliance to make people do what he commanded. The truth is the Wizard has NO real power & only used illusions to create false power & authority.