The Queen of the Aldmeri Dominion, as well as its founder. She was the first in line for the throne, and her abrupt return caused her brother to lose his shot at the throne. She is not popular in certain circles of Altmer society, due to her rejection of the culturally institutionalized Fantastic Racism many Altmer still hold.
Action Girl: Despite being the Queen, she's a damn good fighter in her own right.
The Good King: More The Good Queen; pretty benevolent by Altmer standards, though she still thinks humans are unfit to rule Tamriel.
Humans Are Bastards: While she's not nearly as big on the Fantastic Racism aspect of this trope as some of her predecessors (and future successors) were, the fact that she still believes this to some degree is why she doesn't want either the Pact or the Covenant controlling Cyrodiil.
Lady of War: As nice as she is by Altmer standards, she's quite ruthless when it comes to the war and keeping her own house in order.
Noodle Incident: At one point, she had one of these with Razum-Dar. She isn't keen on sharing the details. Except to say that it involved a schoolmarm dress, lots of wine, and some city that began with the letter W. (Either Whiterun or Windhelm, she's not sure.)
State Sec: The 'Eyes of the Queen' are part Secret Service, and part Central Intelligence Agency who are allowed to do pretty much whatever they want, so long as it is for the good of the Aldmeri Dominion. They answer directly to her.
Body Horror: Happens to him when the Orrery activates. He becomes a big, fat monstrosity that tries to attack Ayrenn.
Came Back Wrong: He is brought back as a Lich during the Greenshade arc by Pelildil.
Green-Eyed Monster: Is secretly resentful of Ayrenn ascending to the throne instead of him, but he still loves and supports her anyway. The Orrery takes this Up to Eleven by forcing these feelings to the surface.
My Country, Right or Wrong: Played with. He doesn't agree with his sister's policies, not the least of which involved ordering the death of his wife, or how the Dominion is run, but still aids his sister out of loyalty.
Spare To The Throne: His coronation was set within days of his sister's return. Actually takes it rather well, all things considered. His wife, on the other hand...
Tomato Surprise: The Orrery reveals that he was deeply resentful of Ayrenn ascending to the throne, and when it brings these feelings (and some Body Horror) to the surface, he tries to assassinate her.
Wrong Genre Savvy: He thought giving rule of Rivenspire to a triumvirate of leading noblemen would allow him to stymie any attempts to unify the region against him, pretty standard Chessmaster stuff. Unfortunately, it led to a civil war in Rivenspire at a time when the Covenant cannot afford internal conflict.
A Redguard Sailor, she saves the Soulless One from drowning if they sided with the Daggerfall Covenant
The Caper: She's the brains behind one and has a questline requiring you to collect the members of, and pull of said heist.
Deal with the Devil: In order to prevent the destruction of the Lightless Remnant, cursing everyone in Rivenspire with vampirism, he makes a deal with Molag Bal to take it with him to Coldharbor.
Friendly Neighborhood Vampire: You walk in on him and his retinue feeding on someone, who then explains that he was well-paid and cared for by the Count in exchange for his blood. He also offers an invaluable insight into the bloodfiend problem in Rivenspire.
Old Friend: He was one of High King Emeric's earliest supporters.
Token Heroic Orc: An Altmer vampire who is a high-ranking nobleman of High Rock.
Almalexia (a.k.a. Ayem)
One of the three living gods that compose the Tribunal of Morrowind, and leading representative of the Dunmer in the Ebonheart Pact. Ruling alone in the absence of Vivec and Sotha Sil, she resides in the Tribunal Temple in the Dunmer capital city of Mournhold.
A God Am I: She's one of the only physical gods in Tamriel, the others being Vivec, Sotha Sil and Dagoth Ur.
Gods Need Prayer Badly: A variation. Almalexia acknowledges that the power and influence of the theocratic Tribunal is proportionate to the amount of faith the people have in it. Just like any other political ruler, Almalexia would be powerless without the support of the masses.
Good Is Not Soft: Kind, benevolent, fair, and capable of ruthlessly smiting anyone who dares to threaten the peace of Mournhold.
Lady of War: She may be a god, but that doesn't mean she won't personally deal with those who attack her city or people. See Good Is Not Soft directly above.
Light 'em Up: Employs a variety of light-based magic, ranging from relatively mundane (hands-free lanterns) to incredibly lethal (massive spears of golden light).
Mama Bear: If you do anything to threaten the lives of her 'children', Divines help you.
Physical God: Like the rest of the Tribunal, thanks to the power of the Heart of Lorkhan.
Power Floats: She's always seen elegantly hovering a few inches above the ground.
Warrior Poet: Prior to becoming King, he was a skilled Skald.
A dunmer assassin under the employment of the Morrowind-based Morag Tong. She is encountered multiple times throughout the Ebonheart Pact storyline on missions to investigate (and neutralize) potential threats to the security of the Pact.
Deadpan Snarker: Quite possibly the snarkiest female character in the game.
Femme Fatale: She can certainly turn up the charm when the job calls for it.
The Fettered: Morag Tong assassins are bound by a Code of Honour which prevents them from acting without an official contract granting them the authority to carry out a specific job. To illustrate, while in the middle of one of her missions in Deshaan, Naryu discovers with the help of the player that the current threat runs much deeper than she imagined. However, she is unable to do anything about it until she reports back to her superiors and is given permission to investigate further.
Hitman with a Heart: Without a doubt one of the nicest (and snarkiest) assassins ever encountered in the game.
This Is Gonna Suck: When she discovers that the magical wards sealing off access to the hidden tunnels beneath Mournhold have been disabled.
Naryu: So, um, fair warning. This could be bad. Real bad.
The Five Companions
A group of five individuals led by Varen Aquilarios who set out to help find the Amulet of Kings in hopes of making Varen the next Emperor of Tamriel by making him a Dragonborn through a ritual. It fails thanks to Mannimarco, who is revealed quickly to be working with Molag Bal.
Badass: With their combined power, they would be the greatest threat against any forces who dare attempt to invade Cyrodiil.
Imperial Battlemage, Chancellor of the Imperial City, and ancestor of Jagar Tharn. It was he who convinced Varen to perform the ritual that would supposedly make him a true Dragonborn, and ultimately betrayed the rest of the Five Companions to ally himself with Mannimarco once the latter's treachery was revealed.
A Darker Shade Of Grey: He may prove to be an ally at some parts of the game, but he is a ruthless sorcerer who betrayed everyone in the Five Companions and aligned himself with Mannimarco just for his own benefit.
Badass: It takes a lot of bravery to duel Mannimarco despite the necromancer being much more powerful.
Hypocrite: He lampshades a lot of Mannimarco's ego and lust for power. While he is against Mannimarco's plan to outplay Molag Bal, he has absolutely no problem in taking the Amulet of Kings at the end of the final quest and attempting to make himself a Dragon Born, according to Meridia.
Jerkass: Lyris makes it a point to call him out on being this whenever the opportunity presents itself.. However...
Jerkass Has a Point: His magical prowess and extensive knowledge of the Daedra, Coldharbour and Mannimarco's plans often prove invaluable.
Pride: He thinks very highly of himself, to put it lightly.
The Quisling: Immediately allied himself with Mannimarco in order to keep his position of power within the Imperial Court and get his daughter on the throne as Empress-Regent. Mannimarco holds all the true power, though.
"Well Done, Daughter" Girl: Believed her father hated her for the death of her mother in childbirth and it provides her a big source of resentment towards him because she simply wanted his love. In truth, he loved her, but he was unable to find ways to show it and he died before he could do so.
An Altmer necromancer, Mannimarco serves not only as the hook for getting the Player Character into the story via stealing their soul but through his Worm Cult is a threat to all Tamriel.
And I Must Scream: You think Mannimarco is fearless, powerful and The Dreaded of Tamriel, right? Just watch his extreme torture in Coldharbour after attempting to outplay Molag Bal. He literally screams in immense fear and begs for mercy.
A God Am I: His true goal is to replace Molag Bal as the God of Schemes.
False Friend: The others didnít like him, but they still assumed he was loyal to their cause. They were horribly wrong.
Hypocrite: He calls you an arrogant, presumptuous, egotistical twaddle for wanting to defeat Molag Bal, yet he considers himself a god and was cocky enough to think he actually had a chance against the Lord of Domination. Abnur Tharn even lampshades this.
Religion of Evil: His Worm Cult are responsible for dropping the Daedric Anchors across Tamriel and have been rounding up sacrifices to do so.
Too Dumb to Live: Mannimarco made an extremely grave mistake by trying to outplay Molag Bal and take his place to become the new God of Schemes. To say that his arrogance cost him dearly would be putting it lightly.
Molag Bal and other Daedra
Meridia a.k.a The Groundskeeper
The Daedric Prince of Life and Energy. She assists you in the main Coldharbour quests to thwart Molag Bal and end the Planemeld.
Big Good: Is this for the main questline in Coldharbour.
The Chessmaster: She uses you (which she even admits) to build her an army and use it to destroy the Planar Vortex and outplay Molag Bal, which completely ends his Planemeld.
God of Evil: While he's not the only malevolent Daedric Prince in Oblivion, he's certainly the most prominent one in this game, and the largest threat to Tamriel. Indeed, out of all the daedric lords, he's the only one who seems to be purely malevolent; even Mehrunes Dagon, big bad of Oblivion, had positive attributes as the god of change and revolutions.
Graceful Loser: After the final battle when you defeat him, you transport to the Colored Rooms of Meridia to reclaim your soul. He appears as a phantom and congratulates you in a cold and venomous tone.
An old and surprisingly sane soul shriven of Coldharbour who will guide you on a certain quest throughout Coldharbour.
Badass: He may be a bit mad, but he isn't afraid of anything. Not even Molag Bal. He also manages to slay Molag Bal's daughter with no equipment other than a poor-quality sword (albeit with help from the player) and survives the destruction of the Planar Vortex despite being outside Meridia's barrier.
Big Damn Heroes: He becomes one of the closest allies to you once you go to Coldharbour, he assists you on nearly every single main quest. He definitely isn't joking when he calls himself a Knight.
Cloud Cuckoolander: Most notable trait about him, he even has a pot on his head. Ironically, he's the only soul shriven in Coldharbour that's considered sane.
Insanity Immunity: The reason he's still lucid (for a given value of such) despite being soul shriven - he was already mad prior to being taken to Coldharbour.
King Laloriaran Dynar
The last king of the Ayleids, who was thought to have perished fighting the Alessians alongside the Direnni Hegemony at Glenumbra Moors. It turns out, he was Meridia's champion and master tactician, and was able to place the Hollow City, a piece of Meridia's realm where Molag Bal could not enter, into Coldharbor itself. He is one of the primary questgivers in Coldharbor.
Badass in Distress: He's trapped in the Lightless Oubliette. You first quest in Coldharbor is to rescue him.
Big Good: Of the Coldharbor arc. He's the reason Hollow City is a safe haven for those trying to fight Molag Bal.
The Champion: of Meridia. The Ayleids in general were devoted to worshiping her.
Early-Bird Cameo: He shows up in a quest in Glenumbra Moors, ages before you actually meet him.
Token Heroic Orc: The Ayleids were a monstrously brutal race of elves. Dynar himself is actually not a bad guy.