Pre-TF | Casing | Mutant
I split her reference into 3 parts, for simplicity's sake.
This one is fairly simple just 'cause it's fairly easy to infer the rest of the design based on this angle. Maybe at some point I'll make a proper turnaround for her.

Backstory:
Bonnie joins her boyfriend, Gene, to poke around in a mysteriously abandoned alien spaceship they found, hidden in the forested area outside their hometown. Unbeknownst to them, the deserted ship was programmed with an automated system to replace its missing pilot.... and it chose Bonnie as a suitable host.
The two made it home safe that night, but Bonnie had been unknowingly bombarded with nanogenes, which began toying with her brain. Against her own control, she found herself having wandered back to the ship in the middle of the night. The ship's automated systems had already begun transforming her into a dalek.
The run-down ship attempted to overwrite her mind, but the lack of proper oversight left weaknesses in its ability to squander her spirit.
She was miraculously able to reject the new thoughts the machines tried to inject into her consciousness. She uses her new connection to the machinery against it, managing to halt the process before her mind could be taken. However, it was far too late to save her body.
Horrified and distraught by her transformation, she hides herself away in the abandoned ship, hopelessly using the technology onboard to find a way of reversing the change.
Her boyfriend, restlessly searching for his lost love, returns to the site of the ship on the off-chance he might find her there. After shyly revealing her identity, he is surprisingly open to the idea of maintaining their relationship.
Bonnie, maintaining a mostly unchanged mind, wants nothing more than to live a peaceful life with a man who continues to love her unconditionally despite her new, inelegant form. Together they adapt to their new life, and they do so happily. ~<3

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That was a longer description than I intended; I don't really consider myself a prose writer and I don't like spending loads of time writing stuff up, but I just wanted to get across the story I have in mind for this character!

I think this is the first OC I've made for this account with a semi-developed story behind her.
I wanted a dalek TF story with a happy ending, and something I could mull over/draw when I'm feeling a bit lonely.