Things you've never did in the trilogy

Jeez, I'm looking at all the things you guys haven't done and I've done all of them. I really can't think of anything off the top of my head, I've played the trilogy way too many times, in every possible way with every class.

I did the content with Kelly once. Never the content with Allers, Samara, Javik and James. Yes, I've flirted with James in the main game, but never in the Citadel dlc

Never:

-played any ME1 DLC
-willingly killed a squadmate I could've saved. Jacob's come close though.
-not nuked Kaidan
-cheated- I don't consider moving on from ME1 to ME2 cheating since it's been two years, you were dead, and the other parties have moved on and are either cold or downright bitchy upon reunion. If I planned to stick with Liara or Ashley in a playthrough I never romanced anyone else.
-romanced Jack, Steve or any of the femshep options. Probably because:
-never finished femshep (or finished a different Shepard at all, for that matter).
-never played non-infiltrator in SP, or non Spacer/Ruthless. I have one Shepard... is I guess... the main bullet point in this presentation.
-never followed paragon/renegade only

-killed the rachni queen
-killed Shiala
-saved the council
-chose Udina
-killed Wrex
-denied Tali the geth data
-not recruited Garrus or Wrex

-sent anyone to Cerberus
-not recruit a squadmate
-not been reinstated as Spectre
-let Miranda kill Niket
-spare Sidonis
-betray Samara (I've save-reloaded to get the bonus power but never played through with Morinth)
-kept the graybox
-sided with Jack vs Miranda
-not been able to resolve the Tali/Legion fight
-get Tali exiled (or expose her father). Also obviously, never not hugged Tali at teh proper time.
-supported war with the geth
-destroyed the heretics
-kept the collector base
-warned the batarians
-not throw that merc out the window

-chose Dr. Michel over Dr. Chakwas
-not re-recruited Ken and Gabby
-sabotaged the genophage
-not made peace at Rannoch
-talked down the VS in the coup
-not tell Garrus I could've absolutely pulled the trigger if it came down to it.
-let Garrus win the sniping contest, or Jacob win the rock'em sock'em robot game in Citadel. I would've, but then he started talking shit.
-never not mocked the space chess asari with "have the asari ever won a war?"
-turn down Allers or boot her off the ship
-not bring Javik to Thessia
-let Aria kill Petrovski
-cockblocked Joker
-tried to save the clone or spare Brooks
-chose destroy (I'd like to say I never chose synthesis either, but that first time I was just so in a daze I kept walking forward until it was too late)
-chose refuse by way of conversation(I think I did shoot the holokid post EC though).

Probably a bunch I'm missing. In general I help nice characters and kill assholes.

Never killed Wrex
Never romanced Liara
Never played Pinnacle Station
Never killed the Rachni Queen
Never killed Shiala
Never let the Council die
Never recruited Morinth
Never destroyed the genophage data
Never saved the Collector base for TIM
Never shot Mordin in the back
Never chose Blue or Green
Never finished an unmodded version of EC

Those are the big ones I can think of.

Neither have I since its not available for the ps3.

Never played full Renegade
Never chose Control or Refuse
Never completed a FemShep run
Never chose Ashley
Never decided against recruiting a potential squad mate
Never allowed Shepard to die
Never chose not to romance at least one person by the end of the trilogy
Never had private time with Kelly Chambers
Never left my scars
Never romanced: Ashley, Garrus, Thane, Kelly, Traynor, Miranda, Tali, Jack, Jacob Allers or Samara
Never recruited Morinth
Never killed Shiala
Never left Grunt in the tank
Never shot Kaidan
Probably more, but I think what I've listed is sufficient to show that I've got a lot more areas of exploration. I've actually done some things I never thought I'd do. Some of the above still stands in that category but that may change.

I never did Thane's loyalty mission until like a thousand playthrough. It's just a boring CSI stuff which I strongly disliked.

I have never started the game with Sheploo.

Hmm, I don't even know what some of the things you guys are mentioning, like romancing Steve (who's Steve?) and choosing Refuse Ending (as far as I saw there was Control, Destroy and Synthesis), or killing Shepard in ME2 (?)

From what I have seen, and what I plan to do, I definetly won't:

Play any of the DLCs, save for Bringing Down the Sky
Play Engineer, Adept or Infiltrator in SP
Romance Ashley and Miranda
Play with default face
Not romance anyone at all
Not use Renegade Option on Kai Leng
Miss recruiting anyone (though will leave Grunt in the tank)
Figure out the intricacies of killing off a specific companion

I have never played through the games as anything other than a soldier so far, and I've always been male Shepard.

Apart from the first time I played the original game and I didn't have enough charm/intimidate points to resolve the situation on Virmire, I've never let Wrex die to see how that would carry through to ME2 & 3.

First time I played the game I romanced Ashley but any other play-through since that I have always romanced Liara, and I always choose to rescue Kaidan as I like having him in ME3.

Never allowed the Rachni to survive in ME.

Apart from the first time I played through the SM in ME2, I have never allowed a character to die, other than Kelly and I think maybe a few other minor characters, but Dr Chakwas always survives through to ME3.

My first ever play-through of ME2 I romanced Miranda but any other since then I have always remained faithful to Liara, and I think that resonates beautifully in ME3.