The starters so far haven't hit home with me too much. Popplio definitely is the cutest atm for me. I'm mostly hoping it doesn't look goofy/funny on it's 2nd and 3rd forms though. So my answer for now will be Popplio <3
Rowlet aka the Grass starter is still leading by a landslide... I have a fear that Team Rowlet may be divided if the evolutions are a letdown. It was exactly what happened for Team Fennekin in the Kalos starter race, it lost members when Delphox came out.
I'm almost certain that once the evolutions are revealed people will quickly change their opinions. It's happened so many times before, even with myself for the likes of Chespin. I'm really hoping this is the case for these starters though, I'm great with Litten but the other two could be improved on which is where I'm hoping their evolutions will make up for that. The only con I'd have with Litten is if it turned out to be another Fire/Fighting which is a possibility; Fire/Dark would be great since it could counter Houndoom having a feline/canine of the same type combinations.
Why couldn't we just have gotten a dolphin starter?
Well, if the order displayed in-game were inverted, it would be: Popplio (Water) - Litten (Fire) - Rowlet (Grass).I noticed Popplio is officially last, and I know what it's like when my fave starter was once the least popular... *thinks of Oshawott*