CHAOS

Legions

Black Legion

Abaddon - Supreme commander of the Black Legion (ex-Sons of Horus, ex-Luna Wolves). Leader of the 13th Black Crusade.

Asmodeus - Black Legion veteran of 6.000 years. Appointed leader of the 3rd Reaving.

Baphomet - Black Legion veteran. Asmodeu's adjutant. Much overworked.

Word Bearers

Lorgar - Primarch of the Word Bearers (ex-Imperial Heralds).

Erebus - The First Heretic. Leader of the (Dark) Council. He's not always on Lorgar's good side.

Gal Vorbak - Daemon-posessed Word Bearers.

Argel Tal - The Crimson Lord. Leader of the original Gal Vorbak. Long dead, but revered by many.

10th Host - Castor's original Chapter. Fallen on hard times over the course of several millennia.

Castor Rebelius Xandor - Apostle of the 10th. 

Tol Amar - (Possible) First Acolyte.

Belarius - Campion.

Kal Faran - Icon bearer.

Amarath - Bodyguard. Equipped with mltagun.

Melkar - Anointed Sergeant/Captain of the Bringer of Faith.

Obel Gar - Dark Apostle. Leader of the 10th Host. Assassinated by Asmodeus. Has returned as the leader of Castor's Gal Vorbak.

Imran Dhral - Warleader. Former Captain of the 3rd Coy.

Nim Gral - Veteran Terminator Captain of the 1st. Killed by Master Eos. Risen as a Gal Vorbak.

Tam Caron - Captain of the 7th. Former Warleader (under Obel Gar).

Sis Tak - Great Crusade dreadnought.

Doctore - Renegade Apothecary. Convert to the Word.

Kimery - Former Inquisition adept. Turned to the Word. Leader of the Daughters.

Fragmin - Naval savant. Renegade Imperial.

Lumin - Former astropath-turned chaos sorcerer.

Emona - Lumin's apprentice, recruited for a shamanic tradition.

Nissimon - Master Chaos sorcerer.

Magos Venera - Possibly a female. Much augmented. Has eight tentacle-like chaos-infused dendrites. A master of cogitators and memory stacks.

34th Host - Renowned Word Bearer Host. Served with distinction during the march on Segmentum Solar. Now present in Calixis.

Marduk - Dark Apostle. Formerly First Acolyte under Jarulek. Member of the Dark Council. Leader of the 34th Host (Chapter).

Kol Badar - Choryphaus (non-Apostle second-in-command) of the 34th Host. Said to be the finest military mind in the Legion.

Iron Warriors

Perturabo - Primarch of the Iron Warriors.

Duremo - Warsmith of the Iron Warriors. Sent to help with the assault on Scintilla. Reassigined to the Terran Front.

Uriel - Warsmith.

Death Guard

Mortarion - Primarch of the Death Guard.

Adrotos - Death Guard veteran sergeant. On a holy quest for Nurgle.

Task Tak - Blight-master of the Death Guard. Commands a powerful Grand Cruiser and 350 Death Guards.

Dark Mechanicus

Archmagos Viniz-12 - The enigmatic head of the Tech-Priests supporting the Third Reaving. When he appears in "person" he does so completely enclosed within a hovering adamantium sphere engraved with dread runes. The sphere is said to be powered by the souls of  Viniz' enemies.

Nathaniel - Primus Princeps of the Divine Heralds.

Renegades

Kaminisky - Space Marine renegade. Powerful Librarian. Leads his own warband from Diamantina.

Moebius - Dark Angel renegade. Saved Castor during the Horus Heresy. Currently attached to Asmodeus' 'court' as a sort of ambassador.

Xerxzes - Of the Emperor's Children.

Devis - of the Astral Claws. Reaver commander.

Princess-Captain Mikaela - Pirate queen and planetary 'governor' of Diamantina.

Kraal - Champion of Khorne. Seems to have died upon the surface of Karrik. Sad.

Borosa - Pirate captain; without a ship.

duRante - Renegade rogue trader. A convert to the Word.

Affar - Pirate captain with dreadlocks; woven with mementos of the fallen. Now serves as Mikaela's Robes of Office.

Ribben - Champion of Nurgle. Reaver commander.

Tosk - Xenos-loving scum. Reaver commander.

E'danash - Dark eldar reaver.

Althar - Rogue psyker; leads a band of witches and warlocks. Helped defeat the genestealer patriarch.

Daemons

Karnak Zul - Thrice-bound daemonhost. Illusion of normalcy. Summoned and enslaved by Inquisitor Renthor. Freed from the Chains of Judgement. Holds many of the late Inquisitor's secrets, including the location of Consovor and the head of the Dusk Hag.

Samus - "Samus. That's the only name you'll hear. Samus. It means the end and the death. Samus. I am Samus. Samus is all around you. Samus is the man beside you. Samus will gnaw on your bones. Look out! Samus is here."

The Crow Father - Possible name for the daemonic entity that seems to be shrouding this 'Haxtes' figure.

The King in Rags and Tatters - Supposedly the most powerful daemonic entity that's involved with the Calixis sector.

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IMPERIUM

Adeptus Terra

Horus - Imperial commander that claims to be Horus. Master of strategy, tactics and general ass-whooping of Word Bearers.

Fleet Admiral Volkmann - Ranking officer of Battlefleet Calixis.

Inquisition

Lord Inquisitor Melbinious - This name has recently surfaced; it is said to belong to the Grandmaster of the Ordos Calixis.

Haxtes - Some sort of 'super-Inquisitor'; Melbinious is just his Ordo name. has his own entry. He could also be X, the leader of the Haegum.

"The Haegum" - Infamous Radical faction within the Inquisition. Known for its ability to infiltrate, spy and assassinate - many of its agents are rogue psykers or mutants.

Inquisitor "X" - Leader of the Haegum. There are a number of stories concerning X, most of them contradictory; that it's a powerful daemonhost, that it's a woman that no man can resist, that he can predict the future with great clarity. 

Adeptus Astartes

Black Templars: Has long had a presence in this region. There seems to be at least one large Cursade active, as well as several smaller ones.

Green Knights: Obscure chapter from the Calixis sector. Estimated to number no more than 200 marines.

Tigers Argent: Homeworld of 'Icefang' is said to lie within the Finial Sector, but its exact location is not known. Founded primo M39. Primogenitor chapter unknown; possibly a Raven Guard successor, but most likely Ultramarines.

Charon - Chapter Master of the Tigers. Killed.

Eos - Replacement Chapter Master. Very competent and aggressive. Killed in melee with Castor (but not before ripping out the Apostle's guts and tearing off his right arm).