Considered the most beautiful girl on Treasure Island, Amaryllis is a slim young woman with wavy, shoulder-length black hair. She has very large, innocent-looking eyes and delicate facial features, though she often comically twists her face into odd expressions when surprised, typically by the flippant attitude of Senku. Her hips and legs are very wide and curvy in proportion to her petite waist and upper body.
She wears a long, translucent dress with shell-like bra adorned with the symbol of Treasure Island and large platform shoes typical of the Stone World inhabitants. On her neck, she wears a choker and on her head, she wears a stone headdress with two feathers stuck in it.
She enjoys the attention she gets from men and was surprised when Senku showed no interest in her beauty. She nonetheless respects his intelligence and decides to ally with him, as they have similar goals.
She disapproves of the petrification her people had propagated, as she decided she would marry the Head in order to kill him to stop him from petrifying more people.
She is very manipulative, using her looks to her advantage to distract men or have them carry out a favor something for her (though it’s been shown that her motives are altruistic). Her real personality is somewhat more abrasive and short-tempered. She shows strong care for her friends, being horrified when she witnessed them being turned to stone for breaking a minor rule. She came to care for the crew of the Perseus due to them helping her and freeing her people from the tyranny of Ibara.
Abilities and Skills
Amaryllis trained herself to ensure she'd be chosen to join the harem, and as such has many relevant skills.
- Charm: Because of her beauty, she is able to charm several males without problem. However, this only works if the man is attracted to her as Senku was proven to be immune.
- Quick-Thinking: In addition, she proves to be resourceful, managing to avoid petrification by tearing off the part of her hair that was being petrified and swimming to safety.
- Makeup: Despite just learning of it, Amaryllis learn how to use make up and was able to successfully apply it to Kohaku's face, making her more appealing to Ibara.
- Deception: She has proven to be very skilled in the art of deception, as she covered for Kohaku being given a new weapon with a lie over a rat.
In the year 5736, a thirteen year old Amaryllis tried to sneak off the island with her friends before they were caught mid-way by Kirisame and Mozu who used the Petrification Weapon against Amaryllis and her four friends to prevent them from fleeing the Island. Amaryllis narrowly escaped being petrified, as her allies protected her and only some of her hair was turned to stone. As the warriors didn't notice her, she broke off her petrified strands and dove into the water.
Since then, she wanted nothing more than to claim the weapon that took those she cared for.
Amaryllis is first seen, being proposed to by several men who she turns down, much to their sadness. She then meets Senku's group, she wins Soyuz over with her charm before she is shocked to learn he is not the head. Amaryllis is then shocked to see Senku is not all fazed by her beauty. When our village decides to riot against the capital for her sake, I’m a realist tries to stop them before watching the members of the kingdom of science use teargas to keep the men in line. Amazed by their inventions, she soon allies with them.
Amaryllis tells the group about her history and her plan to infiltrate the harem. She is positive about being selected and tries to charm them to help, since their goals align. However, she is surprised that Senku is once more immune but agrees to help. When concerns are made about her going into the harem alone because of the enemy, she questioned where she can find another woman to help. She is given her answer in the form of Kohaku. Realizing that the latter's tomboyish nature might be a problem, they decide to give her a makeover
She dressed her up and tries her best to teach Kohaku etiquette but is surprised by her warrior and crude behavior. Amaryllis joins them in returning to their ship, which amazes her. She notes on how the soldiers have taken it before she identifies Kirisame and watches her battle Kohaku who she spotted before. She hears Kohaku shout the word "lab", which leaves her confused by the unfamiliar word. 
She soon discovers the word was a code for the others' allies. When they are disappointed to find out that it was Ginro, she is confused by their reactions only to find out when he wants them to help him, not the other way around.  
After Ginro and Suika get the Mobile Lab, Amaryllis is amazed by the vehicle and helps in Kohaku's makeover and is successful. She then turns her attention to the men to disguise one of them before settling on Ginro. 
The trio go to her village, where they witness Ibara interrogating villagers on being invaders. When one man is nearly attacked for protesting on how his wife is being taken, Amaryllis stops him and tells him to endure it because she will make sure it ends soon. Quickly putting on her team shy persona, Amaryllis charms Ibara and is selected. She still watches as her allies are selected as well. 
The trio work together when they are selected for the harem. Amaryllis is in agreement with Kohaku on accomplishing the mission, so they can avoid serving a master they've never seen. Amaryllis is in amazed by the earpiece questioning how they can hear their allies. Afterwards, the group arrive at the capital where Amaryllis explains to her allies on how they need to tread lightly with security. At Kohaku's request, she distracts Oarashi by flirting with him and the guards. Amaryllis is then alarmed by Kirisame appearing but is relieved her actions brought Kohaku time, as she returns to tell them she found a key to victory.
When their allies send them items, Amaryllis covered for Kohaku by stating she saw a rat and the latter chased it off as both of them are surprisingly shown to be a good team in their work.
She is later worried when she sees Kohaku and Mozu fighting. She is ultimately horrified to watch Ibara impale Ginro. Running to the pair, she is about to ask of the situation until Kohaku entrusts the rest of the mission to her. With tears in her eyes, she watches her friends being petrified while noting on Ibara lying of the weapon. 
After Kohaku and Ginro are petrified, she runs off to report this to the others, unknowingly being trailed back to the hideout by Mozu. She is soon shocked to discover that the warrior followed her.
However, she witnesses Gen turn him over to their side. She remarks in amazement at his persuasive words. After Mozu agrees she is relieved.
Amaryllis participates in the plan to hold a false invasion. Amaryllis proceeds to steal clothing from the villagers were lying that she had ran away from the harem. Needing extra help for her mission, Amaryllis makes a false promise of eloping with the one who helped her. Amaryllis then informs Kinro of the fate of his brother. 
The group then decide to split into groups with one deciding to show the whole petrification kingdom the true state of the head. Amaryllis likes the idea because all of the crimes committed by Ibara would be exposed. However they discovered that his statue was already destroyed by the evil minister but Yuzuriha planned to recreate the statue.
After long work, Amaryllis in the others are relieved to put the statue back together.
She notices Oarashi running in a frenzy and realizes he plans to head to the island's center and Ukyo has Taiju yell to the others on this. After Taiju tackles him, she warns her friends to throw away the device since Ibara likely activated it but Oarashi had swallowed it and it activates, to her horror.
She is ultimately restored by Senku to help gather food on the island. Amaryllis is amused by Chrome and Ruri's relationship, before getting shocked to hear that she is Senku's ex-wife. She is particularly impressed by Francois' effectiveness. Afterwards, she is present when Kirisame is restored and watches Kohaku and Ginro's revival. She is shocked to hear the transmission of the Whyman who attempts to use the Petrification Device. Amaryllis is worried until Senku revealed he had Kohaku keep it out of range. She is disturbed at hearing the Whyman having Senku's voice.
Amaryllis questions how Whyman has Senku's voice, calling it unnerving. She is later put off by Ginro taking advantage of a newly revived warrior. Amaryllis is shocked to hear there were more devices that fell in his time but shocked when Ryusui and Senku cut him off mid-story.
Due to the Petrification weapon being reactivated by the Kingdom of Science, a large Petrification beam was launched to petrify the whole world. Therefore Amaryllis was turned to stone along with those on Treasure Island.
- Oarashi has a crush on her but won't act on it because he's worried about the consequences of going after someone in the harem.
|Male||Head of Petrification Kingdom • Ibara • Matsukaze • Mozu • Oarashi • Soyuz|
|Female||Amaryllis • Kirisame|
|Alabaster • Argo • Carbo • Chrome • Ganen • Genbu • Ginro • Hagane • Jasper • Kaseki • Kinro • Kokuyo • Magma • Mantle • Natri • Sagan • Sho • Tetsuken • Titan • Unmo|
|Alumi • Azura • Beryl • Dia • En • Garnet • Kohaku • Kujaku • Namari • Ruby • Ruri • Sango • Sapphire • Shirogane • Shovel • Suika • Suzu • Turquoise|
|Soyuz's father • Ibara • Matsukaze • Mozu • Oarashi • Soyuz|
|Amaryllis • Kirisame|