So time to leak some thoughts. (This is gonna be a long one guys, especially as I add more peoples opinions, thoughts and points, be sure to check back frequently to this post if the topic interests you).
Thanks to a small talk with my friend, I just realised that for all I love Twixie, I couldn't really explain why.
Then he kinda helped out and actually gave me a few reasons.
As the finale to Season 3 has made clear, Twilight has been a noble her entire life. Her family is clearly rich or well off, considering that they live in Canterlot, as well as being able to put their daughter into the Gifted Unicorns school (Celestia didn't discover Twilight until -after- Twi was enrolled in the school, doing the entry exam, so there was no in-housing in via royal connections). Let's not forgot that Shining Armour somehow had the opportunity to get close to and spend time with Princess Cadence, which can't be an easy task since she's, you know, a Princess, which puts them further up the social chain as it is.
Twilight's not exactly the girl who lived, under the stairs with a terrible distant-relatives 'family' (points for reference get
This all seems fairly obvious, but honestly, not to me until now. Twi living in Ponyville, making ordinary friends and having a (semi)ordinary life kinda made me forget that she is, well, the one
. Most of the time I've thought of her just as that gorgeous lilac unicorn who lives in a library in Ponyville, not the chosen one from canterlot. Kinda weird huh, considering in amongst this day-to-day life stuff she still saves the world several times, and it still escapes my mind.
Then of course there's Trixie, who's pretty much (as much as I hate to say it because I love her) a bum. No friends, probably no family, no love, barely scraping by in the ever-forgiving world of Equestria, having an even harder time doing that considering Twilight and the others did, despite their good intentions, ruin Trixie's reputation and get her run out of every town she then visited. In fact, that problem probably became worse after Magic Duel, word from Ponyville would probably spread fast of the insane stage-unicorn who used evil magic to enslave a town.
It's kind of a "The Prince" and "The Pauper" thing, although with Twilight and Trixie, it's more like "The best, most special and gifted uni[ali]corn in the history of Equestria ever" and "The completely talentless and friendless hack".
This has got to be why it's such a special pairing. Twilight is everything anybody/anypony could ever want (especially since she is after all, a combination of all of elements of harmony). Pretty much perfect, wherever your opinion stands on her. That's not the point though, the point is, Trixie has nothing and has never really had anything. To go from nothing to everything is the best part of Twixie stories because of course, Trixie always rejects this sudden kindness and love, having never received it, but eventually realises, well haha, all of the freakin' above about Twilight, and why she should be wrapping her hooves around that beautiful lilac pony and never letting go.
I think that's a clincher in a lot of romance stuff for people, the Trixie character not only being lucky enough to have a chance with the Twilight character, but to get her in the end as well. What am I talking about "Characters" though like they're metaphors for others, Twilight and Trixie are right here
==============Addition by Fipse
: I noticed this difference in their social status but you have explained it better then i could have ever done
But we should not forget about the differences in their personalities. I think this is the most important aspect of the stories.
Just look at Trixie. She is always traveling through Equestria (at least we assume she does). No home. No normal day. No plan. Then we have Twilight. She has fixed focus points in her life, she has always a plan (to a point of it being an obsession). Then we put the two together in a relationship. I once heard the joke question if Twilight would plan for sex in a relationship. Of course she would. But with Trixie she would never have the chance. Trixie would give Twilights life a nice portion of "randomness". (yes you could argue her friends already do this...but twilight still plans out her days). Twilight on the other hand would give Trixie a focus point in her life. A reason to stop running away (she always runs away at the end of her episodes).
Of course all of this based on headcanon about Trixie. For all we know she can have fantastic parents or really horrible ones. But surprisingly most fanfic authors seems to give her a "streetlife" backstory. Just like you said.
OK i have no idea if any of this makes sense but well...just my thoughts on this *G*
I love this point you made, Fipse, about Twilight giving Trixie a focus point in her life, a reason to stop running away.
PS: The main reason of course is that these two are just adorable (and sometimes adorkable) together
==============TL;DFreakin'R - I love Twilight x Trixie because it's very special :3
There's probably a lot more to be said about this, but I just can't think of anything else right now, if you have any more thoughts to add please do, as I'd love to hear them