The All Mother

Rain, also known as The All Mother, is the God and leader of the Aeons. She has a mysterious connection to marine wildlife, seemingly allowing her to control them in a manner similar to the fishmen or even Poseidon (as in the case of the Sea Kings).

In her youth Rain was a talented Marine Lieutenant. Having lost her parents at a young age, she was taken in and raised by a Marine Captain. His eventual death presumably caused Rain to become disillusioned with the world, prompting her to form the Aeons in an attempt to achieve immortality for those who actually deserve it in accordance with her own ideals of justice.

Personality
Prior to her father's death, Rain is portrayed as an energetic, lively and enthusiastic young girl who is easily distracted by all kinds of things. She enjoyed the simple things in life, such as cooking and eating good food, spending time with her family and watching animals. Rain is especially fond of fish: it was stated that she finds their colours "endearing and enchanting" and could spend a long time simply admiring the fish at a pet shop. Despite all this, however, Rain has been shown to be keen and perceptive, even at the age of 12, as she was able to instantly grasp the gravity of a morbid situation.

After her father's death she becomes more grounded and decisive. By the age of 16 she has developed the emotional maturity and stability necessary to become a Marine Lieutenant.

Appearance
Rain has long blond hair and bright blue eyes. As a child she wore simple clothes. In her youth as a Marine she donned the standard Marine uniform.

As the leader of the Aeons she now gains a black blindfold over her eyes. Her clothes seem to be a mix of steampunk, water, and religious elements: she wears a blue high-collared leotard with golden ornaments that leaves her midriff and cleavage exposed. A long, blue scarf covers her arms, somewhat reminiscent of a hagoromo (a traditional Japanese garb commonly affiliated with Buddhist deities). She also wears blue and gold thigh-high boots, a golden belt around her waist as well as a golden Aeon pendant around her neck. She also carries twin swords with her in case she needs to defend herself. Despite being in her 40s, she appears significantly younger physically.

Overall
Rain possesses the mental capabilities and leadership skills necessary to function as a Marine Lieutenant, as well as the authority that accompanies the position. She is also a capable combatant, possessing some skill at using two swords simultaneously. It is also possible that she might have eaten a Devil Fruit, and she appears to have some strange connection with marine animals, such as fish and Sea Kings.

Combat
Rain is a skilled fighter, being strong enough to defeat Hastings, a Marine Captain who was stronger than his rank suggested, in a sparring bout.

Two-Sword Style
Rain was taught how to use two swords at the same time in combat by Captain Hastings. Her skill is enough to overcome and defeat her teacher in a training setting. The two swords she uses as the leader of the Aeons are each named The Blade Of The Gods.

Devil Fruit
It is strongly hinted in the ending scene of Episode 33: BAR-BEAR-ian that Rain has consumed an unknown Devil Fruit: when she was submerged in water, she could instantly feel her strength slipping away and became completely immobilized, which is the standard weakness of any Devil Fruit user. But she was a small child in freezing water, so this could simply be the reaction of a normal child. Arzen and V stated in a Flashback that she didn't have a Devil Fruit, but they were also planning to manipulate Rain to use for their own gains, so this could be a lie.

Marine Life
Rain seems to have some sort of a connection with marine animals, as evidenced by her fascination with fish as well as the fact that she was saved by a Sea King. Captain Hastings initially entertains the possibility that this ability could be connected to a Devil Fruit, but it is later confirmed that this is not the case.

Mother
Rain's mother was only ever mentioned, but it can be surmised that they were close and that Rain loved her very much.

Father
Rain and her father lived together for some time after her mother's death, working together to get by every day. Rain admired her father and his cooking, hoping to one day be as good of a cook as he was. His death took a heavy toll on her, and combined with the prior death of her mother as well as her own experiences, caused the previously happy-go-lucky girl to become much more silent and reserved.

Hastings
Marine Captain Hastings found Rain lying unconscious on an unknown island and saved her. He then (reluctantly at first) took her under his wing, becoming her mentor and, in essence, adoptive father. He raised and trained her as a Marine from a young age, and they became very close with time. His death would change her course of life however, causing her to take a very different path in life.

Past
At some point in the past Rain was born to a couple living at an unnamed port. Unfortunately her mother passed away when she was very young. From that day onwards she lived together with her father.

Ending Scene
One day, back when Rain was still a child, her father sent her out to run some errands: she's to bring back some apples for his apple crumble. On her way back home she is distracted by the fish swimming around in a tank behind the window of a pet store. Entranced by the movements of the fish, she stops by for a moment to keep watching them. Eventually she notices being late and hurries back home. Upon reaching the house she notices that the door is unlocked, which she takes as a sign that something is wrong. As she steps inside she is shocked to find her father lying dead on the floor, leaving her to wonder why it's always the good people who end up dead.

Ending Scene
As it turns out, the death of Rain's father was no accident; he was murdered. The assailant proceeds to catch her, overpowering and physically abusing her severely. He then grabs her by the neck and holds her over a large body of water. He proceeds to tell her that he can't allow any witnesses to survive and that all this is just for the sake of business. Amidst her crying, Rain manages to retort by saying that it's not fair that people like him get to live while people like her father have to die. The attacker responds by reiterating that this is all just another job for him. With that, he lets her go and she falls into the water. As she sinks deeper and deeper, she can feel her body grow weaker, and eventually she loses consciousness.

When Rain opens her eyes, she is met by blinding sunlight as well as a man staying by her side, looking at her. As the man expresses relief at the sight of her finally waking up and asks her if she is feeling alright, she sits up and looks around. Regaining her bearings, she asks the man where she is, to which he replies that he doesn't really know himself. As the man explains how he found her in the first place, she asks him to introduce himself, which he does by telling Rain his name: Hastings. As it turns out, the man is a Marine Captain. As he asks about Rain's parents, she starts tearing up, prompting him to apologize for asking about such a thing. He then gives her a blanket and sits down next to her. He starts drawing something on his notepad, explaining that drawing has always made him feel better. He shows Rain the drawing and it turns out to be a beautiful drawing of her, which lifts her spirits. Hastings speaks up again and, assuming correctly that the girl's parents are gone, proceeds to tell her that he knows how she feels, having experienced something similar in the past. Handing the drawing over to the girl, Hastings stands up and gives out his hand. He then asks the girl for her name, and, taking his hand, Rain introduces herself.

Ending Scene
Some time after their first meeting Rain joins the Marines, and her natural talent coupled with her eagerness to learn results in rapid growth. This causes some to refer to Rain as a prodigy, and rightfully so, as she reaches the rank of Lieutenant at only 16 years old. As they continue training and going on missions together Rain and Hastings grow ever closer.

One day, four years after their initial meeting, during a sparring match Rain finally manages to defeat Hastings using her two-sword style. Hastings is impressed and begins to congratulate his protégé. As the two converse, their ship closes in on their destination; they can see the island harbour. As Rain wonders about the meaning of all this, Hastings explains that he wants to help her to understand the "thing she has", and to that end, he has enlisted the help of some of his colleagues. As the ship arrives in the harbour, Rain and Hastings see two men standing at the docks. One of the men greets the two, and Hastings introduces them as Captain Arzen and V.

Ending Scene
As Arzen works on experimenting on Rain, she has a brief conversation with V about immortality. When Hastings enters the room, he promptly asks her to come with him, and she complies.

Ending Scene
Standing on the deck of their ship, Rain and Hastings talk about Arzen and his tests: Rain asks the Captain about the results and when they might find out about them, but he tells her to be patient. As the two playfully converse, Hastings states that her ability isn't connected to a Devil Fruit.

Suddenly something hits the ship. Hastings and Rain lean over the side of the ship to see what's wrong, and a submarine surfaces unexpectedly. Rain questions the Captain about the ship and he proceeds to tell her about submarines, but notes that this one doesn't seem like a Marine vessel. A man then emerges from the submarine, calling out to Hastings. Rain stands by as the two talk briefly before the man jumps onto their ship, at which point she charges at him. Rain and the man lock weapons and he calls her a "tough bitch", much to her dismay. Hastings then joins the fray as the two engage the man in a brief combat, during which Rain is kicked in the chest and knocked back. The man uses this opportunity to wound Hastings, which prompts Rain to let out a scream. A sea serpent then appears, biting down on the intruder and ripping him apart. Rain then falls unconscious.

As she wakes up, Rain notices Hastings lying on the deck of the ship. She also sees the remnants of the assailant's body and notices a candle-shaped necklace among his clothes. She then proceeds to move over to Hastings, only to realize that he's dying. Rain and Hastings then exchange a few last words before the Captain passes away before her eyes.

Rain would later join forces with Arzen and V, along with Jefferson and another Brother, to found the Aeons.

Once Rain became the leader of the Aeons, she stayed in her room, ignorant to the evils the cult was spreading. Once she fought the Crew and she started to doubt herself, her power flowed out uncontrollably causing many of corpses in the walls of the Aeons HQ to come out and attack everything. After trying to spare her life throughout the fight, Verona was forced to shoot her through the heart once William was in grave danger. She was buried on Chronograd by Duros.

Major Battles

 * Rain vs Unnamed Assailant (off-screen) - Lost
 * Rain vs Captain Hastings (1st bout) - Lost
 * Rain vs Captain Hastings (2nd bout) - Won
 * Rain and Captain Hastings vs Skendor - Won
 * Rain vs The Devil's Luck Pirates - Lost

Trivia

 * Rain is the first named character to appear in the ending scenes, but the second one to be actually named (after Hastings).

Quotes

 * "Why do good people have to die?" - Rain upon discovering her father's body
 * "You're talking about...immortality? There's no way you can prevent death." - "What if I said you could? Would the world not be a better place?" - Rain and V discussing the topic of cheating death
 * ”You are just a bunch of idiots that don’t know what they are doing!” - the All Mother to the Devil’s Luck Pirates.
 * ”They told me when the devil would come, it would come with lies!” - the All Mother to the Devil’s Luck Pirates.
 * ”I just want to bring him back” - the All Mother to William about Captain Hastings.