Freudian Trio/Web Original

Examples of s in include:

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

Homestuck
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)

TGS Podcast
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)