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The Inquisitor!

Play an inquisitor sent to denounce the blasphemer Lord Dredmor. Fun, huh?!
Updated yet again. Inquisitors now start with 3 potions of radiance. In addition, Hellfire and its flamefield now burn enemies.
If these updates messed up a save of yours, easy solution: start a new save with the exact same skills you are currently using in your savegame. Now, take all the files labelled -mod#.dat- and replace them in your old save (find them in the Gaslamp Games directory). Done! Mod updated in-game. No need to restart a run.

Inquisitor
The King? No matter; there is no doubt in your mind that God Himself has commanded you to march into Dredmor and purge the heretic Lord Dredmor!

Skill Portrait (starting skill):
Inquisitor
Being exceptionally pious (and a seminary graduate - certificate, ID, and diploma included), you have a head start on being righteous. You are also a tad bit smarter, because having started down this road in life to begin with is the mark of someone a cut above the ordinary. Being religiously intolerant also makes you less empathetic. You know you're righteous as a result, right? Now don't go patting yourself on the back! Leave that to others. On a side-note, active combat inspires you to do great things.
+1 sagacity, +1 caddishness, +1 savvy
+1 existential resist, +1 necromantic resist, +1 aethereal resist, +1 righteous resist
+1 righteous damage
20% to proc Religious Conviction on kill

Skill 0: Remember Scripture (you start with this)
Your education serves you well; recalling a life-giving passage can be life-saving. Warning: May also drain the mind.
Removed passives for balance.
Ability: Remember Scripture
Triggers a cancelable buff which adds:
+10 hp regen, -10 mp regen
and now has a chance to trigger Truth Hurts debuff.

Skill 1: Spread The Word
Even heretics can be brought back to the light. If you feel up to it, why not try preaching to them? Warning: Our data clearly shows that heretics are backstabbing scum.
+1 righteous resist, -1 necromantic resist, -1 aethereal resist
+1 righteous damage
Ability: Preach
Resistable charm spell. If it works, charms a monster for 30 turns, but has a 40 turn cooldown.

Skill 2: Epiphany Of Moral Superiority
Even the most pious of us can still learn something. You just happened to stumble upon an astonishing revelation! You can spot and fight heresy (and traps!) with greater precision and finesse than before. Unfortunately this also means that the demons behind said heresy hate you. No, I mean they REALLY hate you now. You don't care at all, though, do you?
-1 existential resist, +1 righteous resist, -1 aethereal resist, -6 necromantic resist
+2 righteous damage
+2 caddishness
+1 trap affinity
+2 trap sight
+1 LoS
+4 enemy dodge reduction
Skill 3: Retinue
An inquisitor is always eager to spend some time with one who can feed and defend himself, discuss religion, and help with the persecution.
+1 righteous damage
Ability: Retinue
Summons a Monk NPC which, unless you make a weird build, you will depend entirely upon for warrior support. Gets weaker later on, though.
After another bit of testing, redoubled the cooldown to 40 turns to summon. No spamming!

Skill 4: Holy Debater
Playing with fire is dangerous. Before you start burning people, you prepare yourself, just in case they try to burn you back.
+1 caddishness
+1 stubbornness
+6 conflagratory resist, +1 righteous resist, +1 existential resist, +1 aethereal resist, +1 necromantic resist
+10 missile reflect
+1 counter chance
+2 enemy dodge reduction

Skill 5: Inquisition
This is it. Your entire life has been leading up to this moment. Heresy cannot hide from you anymore. Denouncement deals massive damage, but only to a single target. Damage scales to Caddishness.
+2 conflagratory resist, +1 righteous resist, +1 existential resist, -1 aethereal resist, -1 necromantic resist
+1 blasting damage, +2 righteous damage, +5 conflagratory damage
Ability: Inquisition
Now fixed to actually scale to Caddishness. Still deals blasting/conflagratory/righteous damage.

Skill 6: Aspiring Saint/Hellfire!
Many consider you a living saint now, even some of your enemies. Even so, your violent nature might prevent canonization. Unfortunately this makes you all the more obvious to those who wish you harm. Use this spell to make them taste the fires of Hell! Warning: May backfire if used unjustly. Warning 2: Do not shoot yourself. Note: The cross-shaped impact point deals more (initial) damage than the firewall.
+2 conflagratory resist, +2 righteous resist, +2 existential resist, -1 aethereal resist, -1 necromantic resist
+1 conflagratory damage, +2 righteous damage
+2 sagacity, +1 caddishness
-10 sneakiness
Ability: Hellfire
More powerful version of Obvious Fireball, basically, which can and will inevitably backfire. Also makes a flamefield that deals righteous and conflagratory damage. It can damage you, so do NOT get in it if you have Hypocritical Innocence on. Instant death awaits.

Skill 7: Summon Angel
I mean, why not? No, you can't pray and summon God. That would be totally game-breaking. However, did I mention that it's quite evident someone up there loves you very much? (Those down below hate you even more than He loves you.)
+1 sagacity
+2 magic power, +2 enemy dodge reduction, -10 sneakiness
+2 hpregen, +2 mpregen, +5 missile reflect
+4 righteous damage
Ability: Summon Angel
Angela is an extremely powerful ally, designed to help deal with late-game enemies. She is not invincible, though, so don't count on it. No cooldown to summon, but expensive on the mana.
UPDATE: She and the Monk have received minor buffs, nothing major.
Again.

Let's talk about the (de)buffs for a second. Whenever the spells are used, they can trigger:
Kill (Something):
Religious Conviction - 20%
Preach:
Religious Conviction - 25%
Inquisition:
Religious Frenzy - 25%
Religious Conviction - 25%
Hypocritical Innocence - 5%
Hellfire:
Religious Frenzy - 25%
Religious Conviction - 25%
Hypocritical Innocence - 10%
Additionally, now Remember Scripture can trigger:
Truth Hurts - 10%
What do these do? Let's see:

Religious Conviction - lasts 20 turns, does not stack
+1 caddishness
+10 missile reflect
+1 crit
+1 haywire
-10 sneakiness
+2 necromantic resist
+2 righteous resist
+4 righteous damage
“Beata Maria, you know I am a righteous man...”

Religious Frenzy - lasts 20 turns, does not stack
+2 caddishness
+25 missile reflect
+2 crit
+2 haywire
+2 magic resist
-30 sneakiness
+4 necromantic resist
+4 righteous resist
+8 righteous damage
“LAY DOWN YOUR ARMS IN THE NAME OF JESUS! OTHERWISE, I'LL UTTERLY DESTROY YOU!”

Hypocritical Innocence - lasts 30 turns, does not stack
-5 magic power
-15 haywire
-30 righteous resist
-10 conflagratory resist
“Hey, even the best of us still make mistakes, heh-heh...”

Truth Hurts - lasts 10 turns, does not stack
-1 magic power
-2 dodge
-6 righteous resist
Truth is a double-edged sword. In remembering scripture you remember that we're not perfect and some passages put you in a compromising position.

As I said, inquisitions ARE fun the other way around.