Lysandra Pyra

Here's why this name fits the parameters:

• Inquisitor: The name sounds authoritative and fitting for a high-ranking Imperial official.

• Imperium: The name uses elements common in Imperial naming conventions, avoiding overtly alien sounds.

• Female: "Lysandra" is a clearly feminine name.

• Powerful Psyker: "Lysandra" suggests strength and mystery, while "Pyra" directly evokes fire and powerful, potentially destructive, psychic abilities (referencing "pyre" and its association with intense heat and destruction). The combination hints at a controlled but potentially volatile power.

• Likes Fire: "Pyra" is a direct reference to fire, fulfilling this specific request. The sound of the name also has a fiery, sharp quality.