Marked is a Poptropica-based story about two gods debating over the purpose of humanity and the seven girls they observe throughout time. Each girl has a connection to one of Poptropica's islands, and each one also has a strange birthmark somewhere on their body.
A deity who doesn't see much point in humanity and wishes to cause chaos just to entertain herself.
A deity who believes in humanity and wishes for them to live without interference.
An heiress who ran away from home with Francine to become a pirate on the high seas. As a pirate she discovered the sword Excalibur, which let her control the actions of others. She later discarded Francine when she no longer needed her. She has a skull and crossbones birthmark on her right collarbone.
A pirate who found Kimberly at a ball and encouraged her to run away to become a pirate. She was abandoned after Kimberly obtained Excalibur and became more powerful.
A scientist who was born with electrokinesis and performed various experiments with cryostasis. She was tasked with creating a large bunker to freeze the population of Steamworks in case of emergency, and ends up maintaining the bunker full of citizens with her electrokinesis until she passes away. She has a gear birthmark on her right shoulder.
Eleonora's master who supervised her experiments with cryokinesis. She was frozen along with the rest of the town when the plants went rogue.
Born with the power to bend others to her will, she lived in cowardice until encouraged to unleash her full power by "friends". She then used her power to rule over the region with an iron fist until she gets taken down by her brother, the one person she can't—or won't—control. She has a bleeding heart birthmark on her right cheek.
He watched as his younger sister felt isolated by her cursed power and remained by her side until her sadistic tendencies awoke in full. He eventually tracked her down and managed to capture her when she refused to fight back.
The youngest child of a wealthy family, she ran away into the nearby woods after abuse left her in a near-death state. There she was magically healed by the native creatures and began to live among them. She has a leaf-shaped birthmark on the palm of her left foot.
The second eldest son of a wealthy family and a close friend of his sister Drage when they were young. When he came back from boarding school to find out she was missing, he travelled into the forest to find her.
A girl who worked under Director D. as a covert operative until she was kidnapped by Agent Y and realized the truth behind his plans. She then took up Y's moniker and fed information to the newest recruit in order to defeat him. She has an empty set symbol birthmark on her left hip.
A girl who worked under B.A.D. as an assassin until she realized the dual plot of their leader. She then went and found someone like herself to discover the truth behind their pasts, and was murdered by B.A.D. agents to let Null escape.
A girl bullied for her albinism as a child and stole to survive. She was in jail when a meteor hit that gave all of the inmates super powers. As a result she developed cryokinesis and ended up taking the mantle of Silver Ice/the Crystal Crusader in order to detain all of the superpowered criminals. She gains an icicle birthmark under her left eye after the meteor crash.
Sylvia's childhood friend who protected her as best she could from the bullies and continuously attempts to help her lead a straight life. She was the one who convinced her to become a superhero.
An assistant owned by Sr. Garcez in Buenos Aires who she createed a time machine and ran away into the past in an attempt to fix the future. She found herself in Asgard along the way and obtained the mystical weapon Svadilfari. She has a wrench birthmark on her upper back.
One of Anguila's classmates who was genetically modified as a child and worked in Moscow as an adult. She helped lead the assistants' rebellion and becomes the first president of Earth after peace between robots and humans is achieved.
A young adult who spent time with Anguila when she arrived from Asgard. In her youth she had a stuffed bunny she kept, but ended up attending school near where the Dr. Hare incident occurred which resulted in her being bullied for it.
A classmate of Beatrice's who protected her from bullies when they were kids and was her first friend. She left a few years later without telling Beatrice.