Freudian Trio/Web Media

Web Animation
Homestar Runner
 * Strong Bad: Leader (Id, tending toward Ego)
 * Strong Mad: Big guy (Id)
 * Strong Sad: Smart guy (Superego)

Web Original
Sailor Nothing
 * Himei / Sailor Nothing: Superego (The Quiet One)
 * Shin / Sailor Truth: Id (stubborn, obnoxious, in-your-face Plucky Girl)
 * Aki / Sailor Beauty: Ego (relatively normal -- emphasis on relatively)

The Escapist recently started a new column, Extra Consideration. The three contributors are Yahtzee (Id), Moviebob (Ego) and James (Superego)

There are three Homestuck "skewer" bloggers on tumblr who for some reason match this pattern:
 * The "Homestuck Fan Voices" blog is apparently the id, due to frequently lacing perfectly good criticism with personal attacks.
 * The "Bad Homestuck RP" blog seems to be the superego, for an emerging habit of actually trying to be helpful and above-board despite being, as with the other two bloggers, completely anonymous.
 * The "Slum Troller" blog thus must be the ego, for representing the middle ground between the other two blogs and trying to laugh at everything that comes his way.

Echo Chamber
 * Tom: The Leader (Id)
 * Zack: Butt Monkey (Ego)
 * Dana: The Middlewoman (Superego)

Yogscast
 * Simon: Resident pyromaniac; willing to do much more in the name of fun (Id)
 * Lewis: More careful but more willing to get railroaded (Superego)
 * Any NPC travelling/playing with them: Forces the plot along, but goes along with whatever the other two do (Ego)

The three members of the TGS Podcast could be considered this.
 * Jesse Cox bases his opinions on his gut feelings or emotions. Often to the frustration of his co-hosts and viewers. (Id)
 * Total Biscuit goes into a rage now and again, and has a few pet hates that get to him, but is usually rational. (Superego)
 * Dodger seems almost as insane as Jesse most of the time, but when the podcast moves to a serious discussion she often proves to be the most calm and objective of the three. (Ego)

Webcomics
Twice Blessed
 * Cade Masters - the swashbuckling womanizer (Id)
 * Vadim Valntipur - the level-headed old dwarf (Ego)
 * Melchior - the brainer-than-thou mage (Superego)

Arthur, King of Time and Space, which also contains an explicit lampshading here Interestingly, this is almost certainly a homage to Star Trek, at least in the space arc, where Guenevere is the ship's doctor and Arthur, as king, is effectively captain of the Excalibur.
 * Arthur - The laid-back leader who mediates between the other two (Ego)
 * Lancelot - ultra-moral and perfectionistic (Superego)
 * Guenevere - confident, determined, and potentially a source of friction (Id)

Fletcher Apts
 * Bob: Straight Man Hamster (Ego, tending toward Superego at times)
 * Doug: Hollywood Nerd Dog (Superego)
 * Bill: Boisterous Bruiser Goat (Id)

Gunnerkrigg Court:
 * Coyote (Ego)
 * Reynardine (Superego)
 * Ysengrin (Id)

Lagend
 * Nikol Mimagi(Ego)
 * Lewk (Id)
 * Serra Serif (Superego)

The Order of the Stick has two:
 * The half of it left in Azure City when the Order was split up:
 * Celia: Stupid Good Actual Pacifist, out of place in an adventuring party (superego)
 * Belkar: Stupid Evil Heroic Sociopath, increasingly The Millstone (until he suddenly wasn't anymore) (id)
 * Haley: Pragmatic, Chaotic Goodish, has to deal with the mistakes made by the above two along with everything else (ego)
 * The half that escaped with the Azurite Fleet:
 * Durkon (Superego; rational, focused on their long term goal.)
 * Elan (Ego; listens to everyone's point of view)
 * V (Id; focused on his/her own immediate emotional needs [to be the one who saves everyone]. A rare example of a superintelligent id)

In Penny Arcade, prior to the series's begining, there was a third roomate, Jim, who apparently filled this out for the main characters:
 * Tycho: Intelligent and snarky (Superego)
 * Gabe: Emotional and dimwitted (Id)
 * Jim: "Even-handed, and slow to anger" (Ego)

Problem Sleuth
 * Problem Sleuth: charismatic, a born leader, balanced (Ego)
 * Ace Dick: brash, gluttonous, violent (Id)
 * Pickle Inspector: highly intelligent (Superego)

Homestuck has a Power Trio plus one, complete with psychological reasoning:
 * John: Ego
 * Rose: Id
 * Dave: Superego
 * Jade: Unconscious Mind

Something Positive
 * Aubrey: Brash, impulsive, confrontational, slightly sociopathic (id).
 * Davan: Somewhat of a Jerkass, but much more self-controlled than Aubrey (ego).
 * Pee-Jee: Moral (relatively), often the voice of reason (superego).

Slightly Damned
 * Kieri is calm and thoughtful most of the time: Superego (but develops tendencies in the other two types)
 * Buwaro is naive and impulsive: Id
 * Rhea keeps the other two under control: Ego

The Adventures of Wiglaf and Mordred
 * Mordred: self-centered, lazy, and generally only moving if there's something in it for him, often amusement (Id)
 * Wiglaf: the self described "perfect hero," and the one with an emotional need to help people (Superego)
 * Driver: does most of the explanations and lampshading, the laid-back rather than lazy one (Ego)

Narbonic
 * Mell: focused on violence and BFGs (Id)
 * Dave: the worker bee who has the tech skills (Superego)
 * Helen: the Mad Scientist who is their boss (Ego)

Skin Horse
 * UNITY: the violence-oriented zombie (Id)
 * Tip: the psychiatrist who tries to talk things out (Superego)
 * Sweetheart: the genetically-engineered superdog who is the usual team leader (Ego)

Hanna Is Not a Boy's Name
 * Hanna: Emotional but smarter than he seems, a leader, practical (Ego)
 * ...: Nigh emotionless, always cool, taking necessary action and pointing things out (Superego)
 * Conrad: Short-tempered, blustery, often does not think things through (Id)

Scandinavia and The World
 * Denmark: Fun-loving party boy (Id)
 * Sweden: Logically-minded to a fault (Superego)
 * Norway: Friendly camping hobbyist (Ego)

Jerkcity
 * Pants: Excessively vulgar weirdo (Id)
 * Spigot: The closest thing to an all-rounder (Ego)
 * Rands: Clever and intelligent (Superego)

While this still is in development, Nerf Now
 * The Artist: A hyperactive tentacle monster person who enjoys puppets. (Id)
 * The Mascot: Calm redhead who manifests as a character in whatever game is played. (Superego)
 * Josue Pereira: A Brazilian with bad luck and too many choices. (Ego)
 * Argumentatively, since these are not active characters in any storyline (save The Mascot), these three characters could also be heteronyms for the real-life Josue, harkening back to Fernando Pessoa, who developed the concept (and is also Portuguese).

Freefall
 * Sam: (Id)
 * Florence: (Superego)
 * Helix: (Ego)
 * In the strictly freudian context, as Helix is effectively a child and both Sam and Florence compete for influence above him, as seen in this strip.

Furthia High
 * Bruce: (Id)
 * Ashley: (Ego)
 * Campy: (Superego)
 * Kale's Multiple Personalities form another one:
 * "Normal" Kale: (Ego)
 * Fox Kale: (Id)
 * Human Kale: (Superego)