I voted Red XIII.

I have always liked him and his story, its nice subplot in VII. And since Cloud has no daddy issues like many other FF main character its up to Red have special daddy.

I also like Cait Sith ( I like cats), Freya ( she is good character but her story doesn´t gets enough screen time plus red mage outfit is a awesome), Fran is also cool. Ba´Gamnan is my favorites too and one thing I like most about him that he never comes good guy despite you would think that happens in Revenant Wings.