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Tanya was born to Jasper and Vivian Adeola, (TV: Nightvisiting, For Tonight We Might Die) sometime around 2002. (TV: The Coach with the Dragon Tattoo) She had two older brothers, Jarvis and Damon. (TV: Nightvisiting) Tanya had an aunt who brought her a flamenco doll from a holiday in Spain. (PROSE: The Stone House)
When Tanya was little, the family went to see the Regimental Horses and Tanya mistook a puddle of horse urine for a regular puddle, she jumped in it shouting "Puddle, puddle!". This event let to her father to nicknaming her Puddle. (TV: Nightvisiting)
Tanya's father was a policeman. She would look in on him at night, no matter how late it was in order to check that he was okay. This would lead to him checking on her in the same fashion. (TV: Nightvisiting) He passed away from a stroke in October 2014. (TV: The Coach with the Dragon Tattoo, Nightvisiting) Around this time, Tanya attended Coal Hill School. (TV: Nightvisiting)
Coal Hill Academy
Three years later, she started sixth form. Tanya struggled making friends at Coal Hill Academy, due to being younger than everyone else. The one student who offered friendship to Tanya initially was April MacLean, though Tanya wasn't entirely happy with being friends with the school's social outcast. She regularly helped Ram Singh with his homework, and in return, he would pay money into her gaming account. During one of their video calls, Tanya was attacked by a Shadow Kin. She managed to defeat it by removing all the shadows from the room. This knowledge would later help her and her friends, along with the Twelfth Doctor and Miss Quill, temporarily defeat Corakinus and the Shadow Kin at the Autumn Prom. (TV: For Tonight We Might Die)
Tanya continued to do video calls with Ram after the prom. She told him about her dad's death and how she coped with it in order to show him that she understood what he was going through after the death of his girlfriend, Rachel Chapman. She helped Ram investigate a skin-peeling dragon at Coal Hill. She later witnessed Mr Armitage being skinned alive by the dragon while trying to protect April, Charlie, and Tanya herself. She watched as Coach Dawson, who had the female dragon fused to his body in the form of a tattoo, was taken away by the male dragon to be killed. (TV: The Coach with the Dragon Tattoo)
As Tanya and her friends gathered in Charlie's house to decide how to find Ram, who did not come to school, her body was overtaken by "joyrider", James Banks. Miss Quill then knocked Tanya's body out. (PROSE: Joyride)
On the two year anniversary of Jasper's death, a creature called the Lankin came through the rift and took the form of people's dead loved ones. The Lankin, in the form of Jasper, tried to entice Tanya into embracing him and thus allowing the Lankin to feed on her grief. She knew that this was not her father, and poisoned the Lankin with the anger she felt when Jasper died. When Miss Quill drove a double-decker bus into the trunk of the Lankin, it knocked the doppelgänger of Jasper out of the window, and in a weakened state, the Lankin retreated back into the rift. Tanya later reminisced about her father with her mother. (TV: Nightvisiting)
When Tanya saw Amira seemingly calling for help from a window of an old stone house in Shoreditch, she first called the police. When this did not help, she enlisted Ram's help to break into the house. Confronted with unusual sounds inside, they left and she started investigating present and former owners of the house. Tanya managed to persuade all Coal Hill defenders to go and check what was wrong with the house. During one of their visits, the female bone spider living in the house managed to separate Tanya from the others and trap her in the house. There she became friends with Amira, another prisoner of the bone spider. Neither Tanya nor Amira could see who is keeping them in the house. While the spider was distracted by the demolition crew, the girls had a chance of escaping. Instead Tanya insisted on getting to the bottom of this business. Thus, she confronted the bone spider and, though initially scared, soon realised she did not mean to harm anyone. When Miss Quill, Amira and Alan Turnpike captured the spider in her own web, Tanya freed her despite Miss Quill's protestations. Only then could the communication between the spider and the humanoids be established. Tanya also persuaded Miss Quill that it was their responsibility to find the lost child of the spider and led the effort of finding its possible location in the papers left in the attic. Together with Alan she found the baby spider in Parsons family vault and brought her back to the house. She helped Amira report smugglers to the police. (PROSE: The Stone House)
At the time when the killer petals arrived, she became curious if Charlie appeared completely human and asked Matteusz Andrzejewski this, thinking that he would know due to their intimacy. After Ram told her that Corakinus was influencing April, she arrived in time to see April travel to the Underneath. (TV: Co-Owner of a Lonely Heart) After going to tell Ram's father that Ram had travelled to the Underneath, and with him and April's parents they travelled to Coal Hill as the Killer Petals started to engulf humans. She received a text message from Matteusz telling her that "Shadow kills petals". She encouraged Jackie MacLean to picture April in her mind to help April find her way back from the Underneath. She then told April about Matteusz' text. (TV: Brave-ish Heart)
She was put in detention by Quill with the rest of her friends. A meteor containing a Prisoner collided with the classroom, taking it into no-time, no-space. She was intrigued into what the meteor contained and why it was there. After observing that when Matteusz held the meteor he started acting strangely, she decided to hold it to get more information about it. She realised that an alien consciousness was inside the meteor and as he asked them to confess they could ask him things. As part of the anger she felt she confessed that she thought that the rest of the gang didn't think of her as a friend but more of a little sister, as she was three years younger then the rest of them. She also had some racial tensions stirring up inside her. Charlie killed the Prisoner, bringing the classroom back to Earth. (TV: Detained)
She distanced herself from her friends, once she knew what they thought of her. Her mother noticed this and asked her about this but she wouldn't respond and said she was focussing on her studies. Soon after Corakinus killed her mother. This made her angry and she went to Charlie's house to get him to use the Cabinet of Souls to destroy the Shadow Kin. She instead found Quill there who told her to bring the Cabinet to the school. She went to check on her brothers, in time to see Corakinus start to attack them. Quill managed to fight him off, and Tanya asked to be taught how to fight. She used this to her advantage after Charlie, as King of the Shadow Kin, activated the Cabinet of Souls and had to fight off the Shadow Kin who wanted to stop him. (TV: The Lost)
Tanya was intelligent, enough so that she was moved up three years. (TV: Nightvisiting, Detained) She also managed to begin hacking the UNIT database, though this was a work in progress and what she had, she downloaded from Reddit. (TV: The Coach with the Dragon Tattoo) She was also in the habit of hacking the Pentagon. (PROSE: The Stone House)
She proved to be a caring individual, such as when she would look in on her father to make sure he returned home safe from his police work (TV: Nightvisiting) and when she comforted Ram Singh after the death of Rachel Chapman. (TV: For Tonight We Might Die, The Coach with the Dragon Tattoo) She also argued with Charlie Smith over his treatment of Miss Quill. (TV: Co-Owner of a Lonely Heart)