Andrea Quill

Miss Quill was the last of the Quill.

She was a freedom fighter on her home world Rhodia. When the Rhodians defeated her species, Miss Quill was enslaved by Charlie before the Shadow Kin arrived. She and Charlie were rescued from there by the Twelfth Doctor, in the midst of the war. (TV: For Tonight We Might Die)

For Tonight We Might Die
Miss Quill is a blunt and sharp tongued teacher. At night in the school she hides with a student named Kevin from a Shadow Kin that materialises. Unable to use a weapon on the creature due to the terms of her enslavement to Charlie, she orders Kevin to do it. The weapon kills both him and the Shadow Kin.

In class she is blunt and condescending towards her students. She breaks Charlie'a phone when he tries to Google Pop culture references and mocks April when she tries to intervene. Miss Quill actually lives with Charlie who confronts her about Kevin's supposed disappearance. That night she and April are pursued by a Shadow Kin and she orders her to kill it with the gun. April fires but Charlie stops her saving her life. The weapon Miss Quill owns disperses Shadow Kin but also backfires and kills humans if they use it. When April starts clutching her chest in pain, Miss Quill scans her and discovers that, since Charlie intervened with the shot, April now shares a heart with the Shadow Kin and is she dies, so will the Kin.

Miss Quill helps with the decorating of the Prom constantly interrupting Charlie's story about the planet they are from. Charlie calls her a terrorist but she remains firm that she was a freedom fighter and her bond to Charlie is slavery. In reality she doesn't look human.

At the prom, she discovers the Shadow Kin attack alongside April, Charlie and Tanya. Charlie uses the gun since she is unable to do so and he is impervious to the backfire. When the gun is destroyed, Quill prepares to fight the Kin who have come for the Cabinet of Souls which is in Charlie's possession. Thankfully, the Doctor arrives, whom she had previously called, and helps disperse the Shadow Kin.

When the Doctor explains he needs them to deal with the cracks in time, Quill is disbelieving and begs to go somewhere else. The Doctor affirms that it is her punishment for Kevin'a death.