Erika Armstrong is a character from the Surgeon stories. She is a member of a group of students who are fighting against the Great Intelligence alongside various other resistance groups; Erika also makes a return in The Mammal Wars alongside her fellow students.
At the age of eighteen, Erika is one of the youngest students alongside Eleanor Davidson who is also her age. She has brownish hair, fair skin and blue eyes and unlike the other girls who remained at the chapel who wear Chelsea boots, Erika wears far different clothing to other characters who have her surname in particular Ellen and Nicola from the Cold War II series:
Her clothing consists of a white top, blue jeggings, and black Nike Roshe running trainers.
Like her friend Victoria Entwhisle, very little of Erika's personality is not known apart from the fact she has the same loyalty and dedication shared by the other students. It is also assumed that she is friendly with Victoria because once the girls are dismissed, she is shown to be close to her and is shown standing with her when the girls are presented to the Surgeon and Ghazal.
The Surgeon stories:
Alongside the four other remaining students residing at Canongate Kirkyard, Erika is first shown with her group until she is called to attention to introduce herself to the resistance's so called "guests" which are the Eleventh Surgeon and his sole companion Ghazal Rashidi.
When the remaining girls are introduced, Erika is the last girl to be introduced to the Surgeon and Ghazal in Amelia's group and in fact is the last girl to be introduced full stop. Once she has been introduced, the two groups merge to form the remaining student members before the girls are dismissed.
Erika later appears among the merged student groups when her leaders rally the students for what will become the final battle between the resistance and the Great Intelligence and with her students is shown marching to the Camera Obscura ready to do battle with it.
It is also the battle where the Surgeon's support for the students ends because effectively once the Surgeon has Ghazal in his grasp, the pair of them flee from the Camera Obscura and leave the girls for the Intelligence which comes to be destroyed.
Erika returns in The Mammal Wars where she is no longer a student or servant of a villain and instead acts as a criminal. The name of her original group is also changed to "Britain's Angels" all of whom have the ambition to integrate into the Vixen criminal organization or rather its British branch and become Vixens themselves, like the Romanian sisterhood in the East.
She first appears with the rest of her gang at the Buckinghamshire New University in the events hall, a building that has been abandoned a month prior to the events of The Mammal Wars and like the rest of the Angels, listens attentively to what her leader is telling them; unlike Felicity Barbrige however who is distracted by the sound of whooping and two shadowy figures, Erika remains focused.
That is, until the whoops start to get more louder and frequent at which point, the Angels become slowly scared and think that the source of the whooping is coming for them. In High Wycombe, the Angels as well as the whole of Buckinghamshire ignore the warning to stay at home and instead come out in the open to see "Superfox" as their children call him.
But it's also here where the Angels and most of Buckinghamshire see more of the whooping animal; they see that it has a sloping spine which makes it out to be some kind of hyena, but that's it. The only other thing that the animal receives is a name, courtesy of Felicity Barbrige who names it "Jomnune".
The Angels are forced to watch another animal appear: The Shadow Cat as Clementine Galbraith calls it but what Felicity Barbrige calls Vlaasarak who actually goes to fight Jomnune alongside Seslinian. Once the fight goes to Sheephouse Wood, Abigail declares that the Angels will expand even with the threat of The Mammal Wars.
Along with the rest of the Angels, Erika is forced undercover by a combination of Jomnune and the British government who have activated Operation Temperer which has deployed 2,550 armed police officials on the streets all over the United Kingdom, forcing not only the Angels undercover but the organization which they wish to integrate themselves into: The British Vixens.
Despite this though, the Angels are still determined not to let this stop their expansion and during a speech made by her leader, she takes her place in front of Abigail with the rest of the Angels and cheers as Abigail makes the declaration of:
"I promised that the Angels would get an expansion, and Abigail has always kept her promises. Jomnune may have forced police onto the streets but he hasn't taken away our freedom and if we are to get into the Vixens then we have to be brave. This time, neither soldier nor hyena will prevent us from expanding! And that is not a promise but it is something that will happen!"