Mainly I make my characters not as an avatar/projection of myself, but because I like making OCs. Of course preferences are still present there, because these will be characters I will be constantly playing.
Personally I like Midlanders because they're the only race that actually look absolutely pleasing to me. Only a couple faces are terrible for each gender and their proportions are solid. I always see the reason of people not liking Hyur because "they're just boring humans" but having cat ears + tail or horns + scales plastered on your not-human doesn't really make you any special either. For FFXIV, I care more about how good the faces are, body proportions, their animations and emotes than their race features.
Anyway...the other races are okay but I have nitpicks about them.
Highlander: Their faces look unnecessarily terrible. Males have no eyebrows.
Miqo'te: God, I hate them. Next.
Lalafell: They're okay until you realize their head can be as big as a beachball, twice the size of a Hyur's head. Freaky. Their child-like design doesn't really appeal to me.
Elezen: You'd think the elf race would be the beautiful ones ever in the game but the male faces look crusty, sour-looking and terrible. Females are okay and somewhat achieve it if done right, but they only have 2 faces lmao. Their proportions (especially the neck) are too long, and their heads are too small.
Au Ra: The females are okay. The male faces look terrible except one. The male Au Ra posture and run is an eyesore. The horns being tied to the face type isn't good.
Roegadyn: I love the females. I love the males but they can look less square.
Viera: Honestly they're good, but the lack of hairstyles is what keeps them from being great.
Hrothgar: They're cute, but they lack options.
I also don't get bothered with finding twins. With the lack of customization options, it's honestly inevitable to be completely unique unless you go special snowflake with creating your character. I've never found a twin yet, though.
But yeah, the character creation can use an overhaul... There lacks so many options compared to most F2P Korean MMOs, and FFXIV is almost reaching 10 years here. Something like a body shape/muscle mass slider (not the muscle definition slider they have for Hyur and Roes, it works differently), and a real height slider and not some model-resizing slider would be great.