Martha Marriott/Synopsis

History
Martha has taken care of Becky Blackbell since the girl was a child. In kindergarten, Becky would call the other children brats which Martha would try to dissuade. When learning she would be attending Eden Academy, Becky refused, believing the other students were ill-bred. Eventually, Becky begrudgingly accepted that she would go to the school and said that adults must learn how to endure the masses with a smile. Martha then taught her madam to understand how not having everything figured out is the first step toward growing up.

Imperial Scholars Mixer Arc
After Becky invites Anya Forger to go shopping with her, Martha goes to pick Anya up with Becky in their car. On the ride to the department store, Becky complains about Loid not being there, and Martha urges against homewrecking in her thoughts. As Becky and Anya talk, Anya goes through her bag and pulls out a wad of bills which shocks Martha. Becky comments on it not being much, while Martha thinks about how are kids these days. When they get to the department store, Becky takes Anya around to purchase clothing. As Becky buys things, Martha carries them, and as they go to more and more stores, her stack of purchases grows larger and larger. Eventually, the stack gets so large that Martha is hidden behind a wall of clothing boxes and bags. After getting out, she watches Anya comment about having fun shopping with a friend and smiles to herself with a sigh. When looking for something to get Anya, Anya notices the keychain of the department store mascot and decides they should get one as a souvenir of their trip. Becky seems hesitant about the idea, but before she can voice her opinion, Anya buys one for herself and Becky. Becky, having a tough time, gets assisted by Martha, who tells her that not accepting a kind gesture of friendship would be bad for the Blackbell name and that her father would likely say the same. Becky decides that she will accept the gift from Anya because of this.

As Martha drives Becky and Anya, who have fallen asleep, home, she reflects on when Becky was younger and after her first day of school. Becky rushed to Martha with a large smile to told her about Anya and that school might not be as bad as she thought. Martha looks back at the children sleeping, smiles, and gives a slight chuckle before stating how happy she is for Becky.

During the Imperial Scholars mixer, Anya ends up falling asleep while waiting for Donovan Desmond to show up. Seeing this, Becky tells Martha to take Anya back to their car. She agrees and carries Anya on her back to the car with a smile on her face as they pass Loid Forger in disguise as a professor. When they get to Anya's apartment, they greet Yor and Becky announces a special delivery. Martha, carrying Anya on her back again, lays her down on the couch to sleep alongside Bond.

WISE Arc
After Becky finished watching another episode of "Berlint in Love", she gives Anya a call announcing she'll be coming over. She rushes over to Anya's apartment with Martha and slams open the door as Martha struggles to keep up with her. As Becky thinks to herself again about winning over Loid, Martha thinks to herself again about homewrecking being bad. When Loid appears to greet them, Martha instructs Becky to remember her manners, and Becky complies by thanking him for having her. As an apology for coming unannounced, she gives Loid a gift bag which Loid thanks them for before welcoming Becky to their house. Hearing Loid saying her name shocks Becky, who falls to the floor, which Martha tells her not to do. Martha instructs Becky to be on her best behavior and that she'll come to pick her up when their playdate is over. As Loid watches her leave, he thinks to himself about how she carries herself like an experienced former soldier and that he'd expect no less from the Blackbells. When their playdate is over, Martha returns to pick Becky up only to see her practicing her punches with Yor. Martha gives a questioning look, unaware of how things got to this point.

Red Circus Arc
After Mr. Blackbell learns that Becky has been kidnapped, he calls for every tank and fighter jet in their storage to be dispatched and rescue his daughter. Martha karate chops the back of his head and asks him if he is trying to get her killed, telling him not to start a war. Becky's father sobs as he wants to save his daughter. She tells him that while she understands, sending military vehicles after the kidnappers would only provoke them, and they need to act more calmly. She tells him that she will go there by herself. As she says this, she thinks to herself how she hopes Becky is safe.

In a matter of time, Martha and Mr. Blackbell arrive at the scene, where Henry Henderson has also arrived and is surprised to see her. They discuss the state of the situation and their concerns for the well-being of the students inside the bus. At sundown, Billy Squire, the leader of the Red Circus, exits the bus and the police request that they are allowed to supply the children with food and water. Billy agrees, but on the condition that someone from the school brings it to the bus. Martha reveals the field rations she brought while Henry volunteers to give the supplies to the children. After seeing an injured teacher get off the school bus heavily while the door closes with Henry inside, Martha gets confused by the housemaster’s decision and worries for him.

After the other bus is secured, the SSS decides to move into the school bus and kill the terrorists inside. Before they can close in, Billy emerges from the bus, drops his weapons, and surrenders. While everyone is in shock over this sudden choice, Vadim attempts to drive away but gets stopped by the police force's armored vehicles. Vadim rushes out of the bus carrying Anya, using her as a hostage. Before the SSS troops can fire at them, Martha quickly takes action. She jumps on one of their heads, leaping from above and shocking Vadim with a powerful taser. As she catches Anya, the girl calls her "Becky's Lady Person," but Martha corrects her with her full name. After the police apprehend the terrorists and evacuate the student hostages, a crying Becky runs over to Anya and Martha. After Becky reunites with her father, Martha and the Blackbell family return home.

TBA Arc
Martha and Becky arrive at the Forger residence to pick up Anya, since the friends planned to have a day together to go out. At the time of the farewell, Martha has to cover Becky's mouth to forcefully shut her since she began asking Loid if he will come with them and starts praising him as usual, and after it Martha thanks Loid for letting Anya go with them and as they leave the residence.