Dory is very optimistic and kind, but ditzy and forgetful fish. This is because she suffers from short term memory loss. However, she has a heart of gold and was willing to go full-lengths to help Marlin find his son (even though she can never remember his name).
She is also very friendly, fun, and warm-hearted, earning her fast friends. Her kindness was shown as she continued to accompany Marlin on his journey despite his lack of patience with her and his sometimes harsh comments. She developed such a close relationship with Marlin that her short term memory loss seemed to have improved.