Good work! Haha... I think the official list thing on the television show was five or more episodes up to and including season four so Arizona would be out on that count, but I'm going to pretend I don't remember that and just go with the five episodes thing (because Hunt wouldn't count then either)! In which case...
41. Rose
42. Really old guy
43. Mama Burke
44. Mama Yang
45. Jerry O'Malley
46. Patricia (who is Patricia?)
47. Arizona
48. Megan
49. Steve
50. Random psych. doctor (can't picture this character either).

YAY!!!