@Lirimaer 2012 is too early, while the threads are listed as 2012, the actual thread captures where they appear with such icons is much later. The earliest I have noticed with those icons is from 2015, but I'll keep an eye out as I go through 2014 here. (Edit: so basically as far as I can see there are no captures between like August 2013 and December 2014 with those four posters, so the icons must have appeared sometime in that very broad range)
2014
Was Melkor neccesarily evil? -- This thread is the perfect example, the thread is from January 2014 but the capture is on May 15, 2015, and reflects the icons on that date. Pengolodh and Luthien steward icons present.
https://web.archive.org/web/20150515063 ... arily-evil
Are the Dwarves immortal? --
@Aodh Hammerhelm you've probably appeared in threads before this and I missed it, but I didn't miss you this time!
https://web.archive.org/web/20150517144 ... s-immortal
Middle-Earth based comic book characters -- Imagine a Middle-earth character as a modern day super hero!
https://web.archive.org/web/20140326180 ... characters
Dunedain of the North: Where did they live? -- Probably in the North, I'm guessing
https://web.archive.org/web/20150407105 ... -they-live
Most underrated characters in LOTR and Hobbit series --
@Wamba_the_Fool first time I saw your name here
https://web.archive.org/web/20150330085 ... bit-series
Favourite Race? -- Hoth was around in 2014?!
https://web.archive.org/web/20150317073 ... urite-Race
Favorite Maia? -- Oh, you're a Tolkien fan? Name every Maia.
https://web.archive.org/web/20150414020 ... orite-Maia
What happened to the souls of the Nazgul after the Ring was destroyed? -- I can see why lore still had a reputation for being deep waters, oof. It looks different than it did in 2004, but maybe in an even more intimidating way.
https://web.archive.org/web/20150521114 ... -destroyed
Clarification on Hobbits -- A short thread, as clarifications tend to be. Funny the poster tried to put a clarification in advanced lore though.
https://web.archive.org/web/20150407110 ... on-Hobbits
Theology in LOTR -- "We all know how LOTR depicts Christian Theology right?" Uhhhhh do we? Okay we kind of do.
https://web.archive.org/web/20150331224 ... gy-in-LOTR
What I think about the Blue wizards -- More speculation time!
https://web.archive.org/web/20150515023 ... ue-wizards
Was Amlach son of Imlach really impersonated -- Short answer: yes.
https://web.archive.org/web/20150421165 ... personated
Idea about Manwe's Moth -- Trying to make the movies fit lore, a tough task.
https://web.archive.org/web/20150521072 ... nwe-s-Moth
Could Sam have destroyed the Ring? -- A provocative question, to be sure. No short or simple answer.
https://web.archive.org/web/20150516020 ... d-the-Ring
Favorite tale in Tolkien's work. -- Favorite surveys in the lore forum? This wouldn't even make my top three, if we're being honest.
https://web.archive.org/web/20150521073 ... ien-s-work
Arguably Evil Characters -- The sons of Feanor on the schedule but not Feanor himself? Hopefully that's because he's not debatable.

*looks down thread* WAIT WTF I POSTED IN HERE I thought I didn't post past 2010 WOW [Edit -- By comparing captures it seems that between January 2010 and May 2015 I actually made about 200 posts, I wonder where they all were because I remember logging in zero times]
https://web.archive.org/web/20150517172 ... Characters
Warden of the Keys -- "All in all I think fantasywind has already said all that we can know" but fantasywind started the thread, soo...
https://web.archive.org/web/20150415153 ... f-the-Keys
Of Annael -- One whole response here, woo!
https://web.archive.org/web/20150521073 ... -Of-Annael
Legolas vs Boromir -- Like, literally a fight, not whom do you prefer. Although how you answer the first might depend on the second.
https://web.archive.org/web/20150517172 ... vs-Boromir
How LOTR changed you -- A necro'd thread, originally posted in Jan. 2013, and earliest capture in May 2013, where there are no Lore Steward icons. There's a later capture of the thread in 2015 that does show Steward icons. I've posted the 2015 capture link.
https://web.archive.org/web/20150418163 ... hanged-you
Did the Dunedain lay down to sleep in Gondor and Arnor? -- "Ultimately I do not think that this question can be resolved either way from the available texts." Pretty much the summary
https://web.archive.org/web/20150407111 ... -and-Arnor
If Middle-Earth was a mythology -- "This thread is wandering" spot on, Saranna.
https://web.archive.org/web/20150421134 ... -mythology
Gandalf and the Balrog falling into darkness -- Why is this post all in bold arghh also it's a 2013 thread necro'd again
https://web.archive.org/web/20150517125 ... o-darkness
Greatest Act of Evil? -- I'm surprised I wasn't popping in to say something about Feanor in here too, maybe I didn't see the thread.
https://web.archive.org/web/20150515065 ... ct-of-Evil
How did Sauron grow stronger with time after his downfall (after losing the ring) ? -- He ate his Wheaties.
https://web.archive.org/web/20150317064 ... -the-ring)
fourth age??? -- Tell me about the ENTIRE FOURTH AGE
https://web.archive.org/web/20150317070 ... fourth-age
Two Kingdoms -- That is, why not one kingdom?
https://web.archive.org/web/20150417030 ... o-Kingdoms
Do elves sleep? Is is necessary for them to sleep? -- Saranna's link doesn't work :(
https://web.archive.org/web/20150517175 ... m-to-sleep
Trolls -- Discussion on types of trolls and especially of half-trolls (per ROTK)
https://web.archive.org/web/20150415102 ... 611-Trolls
Middle Earth's windows :) -- Where are the glass experts?
https://web.archive.org/web/20150517115 ... -windows-)
Thuringwethil: Of Vampires -- Vampires occupy (fittingly) a shadowy edge of lore in Tolkien.
https://web.archive.org/web/20150517094 ... f-Vampires
Gondor's Eastern Territories -- what threads aren't started by this person? lol
https://web.archive.org/web/20150521082 ... erritories
Ring powers -- "go read the book"
https://web.archive.org/web/20150521082 ... ing-powers
Bilbo and Bombadil -- Never met as far as we know
https://web.archive.org/web/20150404151 ... d-Bombadil
Resources on music in Tolkien's works -- Only one response.
https://web.archive.org/web/20150521082 ... en-s-works
The Age of Elves -- There is a surprising preponderance of New Souls with dozens or hundreds of points/posts in the later years of the plaza, I wonder why that was.
https://web.archive.org/web/20150414072 ... e-of-Elves
mount doom -- Another sneaker trying to post in advanced lore
https://web.archive.org/web/20141201202 ... mount-doom
Thorin's Final Words and Their Effect on Bilbo? --
@Lúthien Tinúviel I do believe I see you started this thread?
https://web.archive.org/web/20150414060 ... t-on-Bilbo
What Are You Tolkien About (Quizz) -- I'm surprised this wasn't deleted, wasn't it against the rules to promote other sites?
https://web.archive.org/web/20150517175 ... ut-(Quizz)
What happened to the Orcs? -- They ain't a monolith though
https://web.archive.org/web/20150419143 ... o-the-Orcs
Treebeard vs Lumberjack union -- Alright, I got a very tiny chuckle out of this thread title, even though it's a dumb thread.
https://web.archive.org/web/20150521082 ... jack-union
Tolkien's Secret Hidden Code -- As opposed to his non-secret hidden code, you see.
https://web.archive.org/web/20150414063 ... idden-Code
So ends 2014.