Original: Whedon , Serenity : Director 's Commentary , track 7 '' Mr. Universe '' Even though he is a macho character , he has shown a particularly intense fear of Reavers , more so than the rest of the crew .
Simplified: Whedon , Serenity : Director 's Commentary , track 7 '' Mr. Universe '' Kaywinnit Lee '' Kaylee '' Frye , played by Jewel Staite , is the ship 's mechanic .