Perry is very protective of Phineas, as well as with the rest of the Flynn-Fletcher family. If he is ever in danger, Perry will stop at nothing to save him ("Journey to the Center of Candace"). He was quite upset to be leaving Phineas and the family in order to work on a new nemesis ("Oh, There You Are, Perry"), and was also upset and regretful when he reveals to Phineas his secret identity, causing Phineas to become angry and feel used.