The rabbit in Donnie Darko is a symbol of hope. Donnie is a troubled young man who is struggling to find his place in the world. He is constantly searching for something to believe in. When he meets Frank, the mysterious rabbit, he finally has something to believe in. Frank represents hope for Donnie. He shows Donnie that there is more to life than what he can see. Frank helps Donnie find the beauty in the world and the hope that comes with it.