A descendant of International Space Station astronauts stranded on Treasure Island, Amaryllis survived a traumatic event at thirteen: her attempt to flee with friends ended with warriors Kirisame and Moz petrifying her companions. She narrowly evaded the same fate by tearing off her petrifying hair strands and diving underwater. This incident ignited her determination to overthrow the island's tyrannical leadership and halt petrification. Celebrated as the island's most beautiful resident, she boasts wavy black hair and large eyes shifting between copper-brown and emerald-green across manga chapters. Her slim, curvy frame is adorned in a cream dress, teal shell bra bearing the island's symbol, platform shoes, and stone accessories including a choker and a pearl-and-feather headdress. Amaryllis merges strategic manipulation with genuine altruism. While leveraging her beauty to distract men or gain advantages, her core mission remains liberation. Behind her charming facade lies a sharp, short-tempered personality. She notably respects Senku's scientific mind despite his indifference to her looks, forging an alliance with him. Her fierce loyalty surfaces in horror at her friends' petrification and emotional reunions with allies like Kohaku. Her skills encompass deception, quick thinking in crises, and newly honed makeup artistry. She rigorously trained to enter the leader's harem as an assassin to stop petrification. Her resourcefulness shines in evading petrification by severing her hair and conceiving the harem infiltration. She later masters makeup to disguise Kohaku for their mission. During the Treasure Island arc, she allies with Senku's group after they quell a village riot. She unveils her plan to infiltrate the harem and steal the petrification device. By transforming Kohaku and Ginro into candidates, she gains them entry to the inner palace. After minister Ibara petrifies Kohaku and Ginro, she escapes to alert Senku, inadvertently guiding warrior Moz to their hideout. Once Moz joins them, she manipulates marksman Yo Uei through flattery. She aids in exposing Ibara's crimes, including reconstructing the petrified original leader's statue. Confronting Ibara, she witnesses Oarashi swallow a petrification device and turns to stone when it activates. Revived by Senku, she assists in gathering resources and restoring the island. Remaining after the Kingdom of Science departs, she helps Soyuz revive petrified islanders. When the global petrification event occurs, she follows Soyuz's order to assume a protective stance, preserving statues. Petrified for years, she awakens nine years later upon the Kingdom's return. She joyfully reunites with Kohaku and announces the rocket launch site's completion. Her name, inspired by the Amaryllis belladonna flower, reflects pride and splendid beauty. Born on Valentine's Day, she unknowingly inspires an unrequited crush in warrior Oarashi due to her harem affiliation.