Who is the human Frank?
Be aware, that there are actually two characters in the film called Frank, who look the same.
One Frank is actually the boyfriend of Donnie’s sister Elizabeth. This Frank is killed by Donnie and is known as a Manipulated Dead, because he was manipulated by the beings of the future and died as a result of this in the tangent universe.
He drops off Elizabeth after a date (just before the jet engine hits the house). He drives past Donnie in his red Trans Am when Donnie is cycling home near the beginning of the film. He is on a beer run at Elizabeth’s party (the notice on the fridge. Note the similarity with the They Made Me Do It handwriting around the school mascot).
Note also that Frank does honk his horn in the first sequence as well, but he doesn’t drive away the second time around.
The other Frank, known as the Messenger, was created by the beings from the future, knowing that Frank was going to wear the bunny suit and that Donnie was likely going to kill him. Only Donnie can see the Messenger. The Messenger guides and instructs Donnie in the use of his powers.
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