I have several options depending on the scenario.
Inquisitor Josephine Cortez.
A radical Istvaanian of the Ordo Malleus. Believes completely in strengthening the Empire through adversity. As an acolyte she bonded to the Daemon Sword Schlac'ta which has preserved and unnaturally extended her life, she believes that she has mastered the sword, but how much influence it has over her actions is uncertain.
Inquisitor Gabriel Ortega.
A Thorian Inquisitor of the Ordo Hereticus. Believes that restoring the Emperor to health or finding/creating a successor is essential for the Empires long term survival as he believes that the current situation is not sustainable.
Rogue Trader (whose name I can't remember at the moment). A longtime associate of Inquisitor Cortez. Willing to take any risk for a profit.
Magos Isabella von Ravensburg.
An extremely dangerous and powerful Chaos Sorcereress. While always a troublesome thorn in the side of the Inquisition due to her possession of the forbidden book known as the Tome of Shadows (according to legend written by Magnus the Red), recent events on the planet Illythia where she attempted to reopen a long sealed portal to the realms of Chaos (foiled in the end by the sacrifice of St Aderyn to close the portal) the vast amounts of psychic energy she was handling (and having to use forbidden alchemy to save her life after having her head smashed in by a power fist) have morphed her into a major threat. It is believed that she is currently gathering together the necessary components to attempt an ascension in order to rise to the level of Daemon Prince. She must be stopped at all cost.
N.b. this character is intentionally on the OP end of the scale as it's expected that she and her family members will be facing off against 2 or 3 Inquisitors and their retinues.
If you're interested in these events Inquisitor Jomar left this report on the Conclave
Legacy report - Interrogator Jack Jomar
www.the-conclave.co.uk