Welcome to Harry Potter Answers. What would you like to know?

Mrs. Norris — saw the basilisk's reflection in the water on the floor. Colin Creevey — saw the basilisk through his camera; the basilisk's gaze also burned his camera's film to a crisp. Nearly Headless Nick — saw the basilisk directly, but, as a ghost, he could not die again. Justin Finch-Fletchley — saw the basilisk through Nick, who was transparent. Hermione Granger — saw the basilisk through Penelope's mirror. Penelope Clearwater — saw the basilisk through her mirror; it is possible that Penelope is half-blooded and was only petrified because she was there when the basilisk petrified Hermione, a Muggle-born