Parker

Parker works for the Department. She is one of the main characters in Mythos.

Mythos
In Mythos, Parker is introduced in the second episode "Glamis". She is a practitioner of chaos magic, who's magic appears to require her to take on new personas to manifest different powers.

She is first introduced as Cinderella Parker (a fire mage), but is said to have been cycling through elemental magics, previously identifying as Ether Parker (presumably air magic), and Cordelia Parker (water magic).

In the third episode of Mythos "Albion", she is introduced as Hermione Parker (an earth mage), but is keen to change since earth magic is "All a bit Woo Woo" and has something worked out to do with Modesty Blaise (https://en.wikipedia.org/wiki/Modesty_Blaise).