Throughout season 1, Angel appears as a 14-year-old girl with purple-dyed hair styled in pigtails, and has piercings on the left eyebrow, lower lip and ears. She also wears a sleeveless, greenish-blue hoodie, red baggy jeans, light purple bands with two starting from the wrist and stopping just below the elbow, and the other two above the purple metal studded elbow pads, two black spiky bracelets, purple studded biker gloves, and buckle shoes with greenish-blue socks in them. Occasionally, she wears a long sleeve hoodie during the events of The Darkness Within. In Back To The Sewer, Angel's appearance has matured, and her hair has been let down and grown out, but consisting of purple streaks. She now wears a black halter-neck top with matching arm warmers that stop at the forearms, metallic bracelets, a necklace with a small red pendant, skin-tight jeans with a gray belt hanging off-center at the waist, and black mid-wedge boots with metal fronts and two thick straps.
Angel is a youth from Casey's neighborhood, who, together with her older brother Ryan, lives with her grandmother. It is not known why Angel and Ryan have no parents, but it is probable that they died and her grandmother now has legal custody of the two. Although Casey promised her grandmother that he would look out for her, he could often not spare the time for it.
As a result, Angel quickly became bored with the middle-class society, which drove her to "cooler" people on the street. She eventually became captivated by the Purple Dragons around the neighborhood and followed them in hopes of joining their ranks. During one of her "tests", which was a robbery, Casey and the Ninja Turtles showed up to prevent them from getting away. Casey was stunned to find Angel among the thieves and tried his best to discourage her from joining them, but Angel ignored him and ran off. Although she escaped, Casey was determined to make sure she didn't join the Dragons officially. He infiltrated their hideout just as Angel was about to fight two Purple Dragon members. Casey stepped into the ring to take Angel out of there, but Hun stepped in and captured him. Hun held a cage match to determine who was allowed to finish their hated enemy. Guilt-ridden, Angel tried to free Casey from his prison but was unsuccessful. Casey told her to contact Raphael in the abandoned warehouse at the corner of Eastman and Laird. When she got there, she was surprised to find four humanoid turtles standing in front of her. They all infiltrated the Purple Dragon's hideout and, after causing a ruckus, managed to escape with Casey in tow. Afterwards, she renounced her juvenile delinquent ways and became a loyal friend and reliable ally to the Turtles.
She later attended the Turtles' holiday party. She and Raphael use some mistletoe tricks to try to help Casey get a kiss from April O'Neil.
Some time after, Angel burst into the lair begging the turtles they help her find her brother, Ryan, who had been gone for three days in an abandoned mansion, looking for gold coins. The Turtles and Angel encountered a legion of undead warriors, where an old man living in the mansion saved them. The four Turtles went back down to conquer the creature that controlled the undead warriors, with Angel being forced to stay behind. The Turtles eventually returned with Ryan.
Later, when the Foot Mystics attacked the Turtles through a dream, the Turtles were chased by the Earth Protection Force. It was suggested they contact Angel and ask for her help, though this led to the deaths of April and Casey.
Shortly after Karai became the The Shredder, Leonardo contacted Angel and instructed her to fake a pizza delivery (due to members of the Foot keeping heavy surveillance on the location) to the Second Time Around shop, where April worked, to ask where the turtles were. April wrote back and Angel gave the note to Leonardo.
Back to the Sewer
Angel came to April and Casey's farm for their wedding and spent the night. Upon coming, she was given a hug by April, who was delighted to see her. Angel arrives as a guest to April and Casey's wedding, and helped fight against the forces of Cyber Shredder. While there, she initially tried to see if Leatherhead was okay, asking him such. When Cyber Shredder was defeated, Angel and the others witnessed the wedding.
- "Fallen Angel"
- "The Christmas Aliens"
- "The Darkness Within"
- "Prodigal Son"
- "Wedding Bells and Bytes"
As a street girl, Angel naturally knows the skills produced in Brooklyn, where she grew up. Through her experiences, she also has certain skills in hand-to-combat, with which she can use to help herself out of tricky situations, and she also has a certain talent in lock picking.