I can concede that Lucina can arguably be considered the main character, or at least they co-star equally. Kind of like an Ephraim/Eirika - Alm/Celica - Lyn/Hector/Eliqood deal, (though I'd call Eirika, Alm and Lyn the real stars).
But for Avatar... eh. I understand he
qualfiies as a reasonable candidate, for technically being the antagonist of Awakening. But to me, this is an issue of
priority. While there's some room for debate between Lucina and Chrom, putting in Avatar before Chrom was just inexcusable in my mind. In fact,
so many better FE reps could have been chosen, nevermind Awakening.
It could be argued the Avatars from each game constitute different characters, too. Ana is a reoccurring character too, haha. But I'm being nit-picky.
I wouldn't be pissed if Chrom/Lucina appeared as a joint character, as Alts, and had a unique moveset. Than I'd honestly have no problems with Avatar at all.
Actually, not only is Avatar NOT the main villain (an alternate version of himself is but it is not truly him) he is also essentially the whole reason the plot goes on and is just as much as a main character as Chrom. Robin had the same amount of screen time as Chrom(if not more), had more moveset potential. Along with that, Robin had more character (he has a support with every single character in the game and that alone helps you learn more about him), more moveset potential (swords and magic), and if Sakurai really wanted to go that far, more customization. I will not say Robin deserved it more Chrom because that is debatable, but take it from me (someone who has played Fire Emblem Awakening enough times to get 98% of the supports plus all of the DLC). Robin absolutely earned that spot on the roster.
Also, due to Lucina's nature and character introduction, she is the third main character of the game. Believe it or not but Basilio and Flavia have just as much screen time as them but she has more impact on the plot. And even then, she doesn't compare to Robin and Chrom.
WITH THAT SAID, I love all of the work that has been done in this thread and I really want to see what is done to that Robin model. Cheers!