Boa Sandersonia

Boa Sandersonia (ボア・サンダーソニア) is one of the three Gorgon sisters that rule over Amazon Lily. She and her sisters are called the Gorgon sisters for supposedly heroically slaying a monster called the Gorgon. She is the younger sister of Boa Hancock and the elder sister of Boa Marigold.

Appearance
Sandersonia is a large woman who resembles a snake. Her large head is shaped like that of a snake's and her tongue is forked. Like the rest of the Kuja, she dresses in very revealing clothing. She is usually seen accompanied with the large panther, Bacura, at her side instead of a snake like the other Kuja. On her back, covered by her cape and her long hair, is a mark of slavery branded on her by previous Tenryuubito masters. Her sisters share this mark as well on their backs.

Due to meaning related to this mark, Sandersonia and her sisters made their fellow Kuja believe that on their backs were a set of eyes she and her sisters received as part of a curse for slaying the Gorgon. They told them that these eyes turned anyone who sees them into stone.

Personality
Sandersonia appears very fond of her sister Hancock as noted by the fact she laughed at her sister's "twisted" personality. While she appears to be living on the lie that her sisters and herself defeated a Gorgon to gain their curse, at the same time she hasn't actually told a lie herself unlike Hancock who is constantly lying.

In battle Sandersonia is a playful warrior who teases and torments her victims before she crushes them.

Abilities and Powers
Ruling beside her sisters, Sandersonia has power over Amazon Lily and the rest of the Kuja women. Being a part of her sister's pirate crew, she is one of the elite Kuja warriors.

She possesses an ability similar to the Mantra of the Sky Island Priests. Using this, she is able to read an opponent's movements and avoid their attacks. The reaction of the Kuja warriors implies that this is a form of Haki. While she can do this, she being able to read an opponent's movement is useless if an opponent is faster than she is.

Devil Fruit
Sandersonia ate the Hebi Hebi no Mi, Model: Anaconda which allows her to turn into an anaconda. While these powers are Zoan Devil Fruit based, the Kuja of the island have been made to believe that Sandersonia's and Marigold's ability to turn into snakes is part of the curse the sisters made up. In their transformed forms, the other Kuja state that Sandersonia and Marigold can do a battle formation called Saragi Dance.

Shameful Past
Several years before the current storyline, when Sandersonia and her sisters were young, the three of them were captured by the World Government while out on sea. They were sold off as slaves to some Tenryuubito and had their backs branded with the mark of slavery. As slaves of the Tenryuubito, they were horribly abused by their masters. It was only until four years later, they were freed from this cruel life. A Fishman by the name of Fisher Tiger climbed up to Mariejois and freed the Fishmen slaves there. While Fisher Tiger hated humans, he also freed the human slaves which included Sandersonia and her sisters.

Sandersonia and her sisters eventually returned to Amazon Lily. Spreading a lie that they had slain a monster called a Gorgon to the other Kuja as a way to hide the marks on their backs, they became Amazon Lily's rulers with her sister, Hancock, as the new Empress.

Secret Discovered
On the way back to Amazon Lily after one of their pirating exploits, Sandersonia and the rest of the Kuja Pirates encountered the Marine Vice Admiral Momonga and his men anchored in the middle of the Calm Belt. Heeding his calls for Hancock to come before him, Sandersonia accompanied her sisters in greeting the Vice Admiral. Despite the Vice Admiral's demands that Sandersonia's sister comply with the compulsory Shichibukai meeting in which Hancock lied about attending, Sandersonia joined in her sister's continued refusal to help the World Government in such a critical. After her sister turned all of Momonga's men to stone, Sandersonia and the rest of the pirates took the stuff they stole from the Marines and returned to Amazon Lily.

After having arrived back, Sandersonia and her sister Marigold set forth to guarding their elder sister from any roaming eyes as Hancock took a bath. Unfortunately, as Sandersonia and Marigold were guarding, Luffy accidentally crashed through the roof of the bath they were guarding. Coming into the bath to see what happened, Sandersonia and Marigold found out that this man had saw what was on their sister's back while she was bathing. Realizing that this man had discovered their secret, the three sisters decided that Luffy had to die. However despite Sandersonia's eldest sister's attempts to turn Luffy to stone, Luffy was unaffected. Knowing that no one could be immune to her sister's beauty regardless of age and gender, Sandersonia guessed that Luffy's fear of death might be overwhelming any wicked desires. Though Sandersonia and her sisters couldn't eliminate Luffy then and there, the man was still captured.

With Luffy captured and brought to the arena of Amazon Lily, Sandersonia accompanied her sisters to see this man be executed along with the rest of their subjects. After her sister turned three Kuja warriors to stone for rescuing Luffy from some mushrooms, the panther that accompanied Sandersonia's side, Bacura, was sent to devour Luffy. However despite her pet's ferociousness, Luffy beat him with sheer brute strength. After this and Luffy's continuing apparent refusal to her eldest sister's charms, Sandersonia accompanied with Marigold decided to take things into their own hands. Facing Luffy, Sandersonia and her sister turned into half snake women and prepared to attack this man in a act the other Kuja called Saragi Dance.

As Sandersonia and her sister battled against Luffy, they decided to torment him by breaking Marguerite, one of the Kuja warriors who saved him, into pieces before his eyes. However just as Sandersonia was about to break Marguerite, Luffy shouted loudly at them to stop. Feeling the force from the Luffy's shout and seeing several Kuja warriors in the audience of the arena suddenly pass out, Sandersonia and her sisters realized that Luffy also possessed Haki whose caliber was on par with Hancock. Stunned by this revelation, Sandersonia and her sister Marigold watched as Luffy decided to fight them more seriously.

Having seen that their opponent was no ordinary man, Sandersonia and Marigold decided to fight against Luffy more seriously as well. Unfortunately, upon Luffy activating Gear Second, he proved too much for Sandersonia and her sister. In the middle of the fray, Sandersonia accidentally got caught on fire by her sister's technique. With her tail also tied to her sister's by Luffy, Sandersonia almost fell down to spiked pit around the arena while on fire. Though the fire was put out and she was able to reach the edge of the arena to prevent her from falling, the fire unfortunately burned all of her top clothing, including the cape that covered her back. With the cape burned, her long hair unable to cover her back due to her position, and the smoke clearing, Sandersonia and her sisters' secret was about to be exposed. However before anyone of the Kuja in the audience could see her back, Luffy covered Sandersonia. Wondering what he was doing, Luffy explained to Sandersonia that despite the fact that she and her sisters were trying to kill him, he had no intention of killing them nor did he had the intention of allowing their deep secret being revealed. With Sandersonia's back covered, her sister, Hancock, ordered everyone to leave the arena.

Trivia

 * Her name comes from the flower Sandersonia.
 * While Sandersonia and her sisters' title, the Gorgon Sisters, comes from supposedly slaying a monster with the same name, their concept is loosely based on the three actual mythological Gorgon sisters which includes the famous Medusa. Sandersonia is also able to convert her hair into snake-like, snake hair was another gorgon trait.