MLP:FIM The Pegasisters guide book

Ch40: Pets;

Angel, or Angel Bunny, is a white, male rabbit and Fluttershy's pet. Angel is somewhat spoiled and bosses Fluttershy around on occasion; however, he does care about her, and is actually intent on helping her stand up for herself, making his name perfectly chosen. Most of Angel's actions are played simultaneously with instrumental jingles. Angel is first introduced in The Ticket Master, where he snatches the tickets to the Grand Galloping Gala away from Spike and gives them to Fluttershy. When Fluttershy is too shy to explain why she wants to attend the Gala, Angel thumps her hoof with his hind leg impatiently, making her explain herself. He later appears in Golden Oak Library, making a salad for Twilight Sparkle while Fluttershy cleans and tidies, in order to persuade Twilight to give the extra ticket to Fluttershy. She tries to tell Twilight that she was cleaning up because they were good friends, before turning to her rabbit friend, whose stern look reminds her of the original intent of providing a special favor in order to receive a ticket.

In Dragonshy, Angel is seen in the opening happily eating a carrot until Fluttershy comes about and warns him to not eat too fast. He then refuses to eat at all and later shows Fluttershy a big black cloud in the distance. Later, when Spike announces that he will look after Fluttershy's animal friends, Angel hops on Spike's head and stomps furiously. This causes Spike to flinch and have all the animals around him scurry away. At the end of the episode, Spike catches Angel just to drop him on his head to make a note to Princess Celestia.

In the beginning of A Bird in the Hoof, he reminds Fluttershy to go to Princess Celestia's welcome party until she remembers and then convinces her to go despite her nervousness. The scene makes a reference to the White Rabbit from Alice in Wonderland, with Angel apparently possessing a pocket watch that he uses for calling Fluttershy's attention to the time. Fluttershy then quotes the White Rabbit from Disney's Alice in Wonderland saying that she's "late for a very important date." After Fluttershy repeatedly thanks Angel for reminding her, he shoos her outside every time she returns to thank him, even going so far as to lock her outside.