|“||It'll be okay, Max. I'll be with you always, no matter what. And Max--I believe in you. Forever.||”|
Biologically related only to Gazzy (he is her brother), Angel is the "baby sister" of the entire Flock, and like a daughter to Max. She is six years old, (though eventually seven) with curly blonde hair and 8-foot-wide, pure white wings that together give her an ironic "angelic" appearance (because she later tries to kick Max out of the Flock and take over).
It's suspected that her avian DNA came from a dove, petrel, or swan). This causes her to immediately fall in love with the stuffed bear she calls Celeste, who is dressed up as an angel. Angel is very mature and tall for her age, standing at 4', but succumbs easily to the joys of places like Disney World and the beach, as shown in the second book. She is very observant and smart for her age, and is surprisingly dangerous because of her intelligence and powerful abilities.
She also owns a small, black Scottish Terrier dog named Total, who was stolen from the Institute for Higher Living. He is a mutant as well, and has abilities such as jumping very high, speaking, and flying with wings that he develops gradually.
Mind reading: Angel has been able to read minds since she was born, but her range was very small and the only way she could pick up thoughts is if she was close to the person she was listening to; as she got older, her range expanded. When she reads the thoughts, she can not only tell what they're thinking but also sense their emotions, correctly interpreting what they are feeling. In ANGEL, Max said, "she can pick up on peoples energy and emotions." It could possibly be that Angel feels the energy of the person's emotions and that's how she reads minds. It is possible that she can see people's memories too.
Some people, however, are immune to Angel's telepathy all together.
Angel is able to breathe underwater due to her gills; the flock cannot see her gills, and Iggy can't feel them either. She can also communicate with fish (since she can read/communicate with minds).
There is also a brief moment when Angel is shown to be able to change her appearance/features, but this technique is only mentioned/used in The Final Warning, and then seemingly forgotten for the rest of the series.
Angel was kidnapped at the very beginning of The Angel Experiment and is known as Subject Eleven to the whitecoats. (It is speculated that Angel will become omnipotent later in life and will turn on the Flock, as she seems sweet but doesn't understand what the difference is between right and wrong sometimes.) Readers were shown in the third book that Angel was evil, but it turns out that it was all a plan she and Max had come up with.
As the series goes on, Angel frequently asks to take over the Flock and become the leader in place of Max, and in FANG, she finally does—the Flock kicks out Max as leader, and Max and Fang leave the Flock. Angel acts much more grown-up in FANG, and approves of Dr. Hans Gunther-Hagen's ideas.
It is revealed that Angel has a Voice in her head like Max had and Ari once had. Also in FANG, Angel points a gun at Max, but it seems it had just been a trick to get Dr. Hans' men to leave the Flock alone. Angel betrays the Flock and goes with Dr. Hans in this book, but returns in the end.
Although her abilities are mainly used to aid the Flock, Angel is not above using them for herself, such as one instance in the fourth book where she cheats in a game of poker against some scientists on board the research ship in Antarctica. She uses this ability in book 5, as revealed by a crew member after finding out she could read minds; they said that "She took me for thirty bucks!"
Angel is the first one to figure out that Max II is a fake, due to her telepathic abilities (though perhaps this was after Fang's realization; he later says to the real Max that he figured it out when Max II "offered to make breakfast," a task the real Max usually leaves to Iggy). She is jealous of Max.
By Saving the World and Other Extreme Sports, the Flock is re-captured by Itexicon. After being captured, Angel was not with the others, but as later revealed, had 'turned over' and 'sided' with the White coats. This however, was seemingly just a cover to help the others out, perhaps with the aid of Jeb Batchelder. Later on, when the Flock is about to be 'retired,' Angel turns on ter Borcht and knocks him out, before distracting and keeping at bay the rest of the white coats while Ari helps free the rest of the Flock.
Max and Angel share a special bond, which is the reason why Angel "turned" on them in the third book to help them escape. Max loves Angel like a daughter, and considers Angel her favorite Flock member. Their relationship changes in FANG, where Angel now wants to take Max's place as leader and betrays the Flock, but she returns in the end and they seem to be okay with each other.
In MAX, Angel becomes more and more disobedient, and Max must "save" her several times. Angel does end up saving the day many times in MAX, though, and in the end she is the key to solving the problem of the toxic waste and the "mountain" (the Krelp) and rescuing Max's mom. Angel approves of Max and Fang's relationship, even giving them a thumbs-up in book five in the epilogue, as they kiss in the sky.
Angel also argues that she is seven, not six, halfway through book 5.
In book 6, she befriends a young girl named Jeanne while the flock is in Africa. In that same book, she and the rest of the flock have a birthday party, celebrating that they are a year older. Angel still says that she already was seven.
Angel assumes the names "Ariel" and "Isabelle von Frankenstein Rothschild" in different points in the series. She is called "Little One" by a group of Chinese scientists (which she cheekily counters by saying "Okay, I'll call you Guy In A White Lab Coat.")