Existential crisis here

[Enkidoh]

Technically 'pure-blood Garlean' seems to be more a genetic trait than an actual 'race', as although their usual physical appearence seems to be light skinned, fair haired and takes after midlander hyur in appearence (like Cid, Nero, Lucia etc), there are confirmed situations where there are pure-blooded Garleans with other appearences that resemble different races.

Specifically Nael was long suspected of being elezen (due to using elezen animations) and was confirmed in Second Coil to have an elezen apparence (specifically wildwood with fairer skin) but possessing the pure-blood Garlean third eye. Likewise Gaius was also in SB is revealed to be dark skinned and dark haired, and looks more like a highlander hyur than a midlander like 'regular' Garleans. Both possess the Garlean third-eye.

Nael probably gets a pass though given the Darnus family apparently having a lineage that dates back to the days of Ancient Allag, so their family tree probably got mixed up somewhere along the line, to say nothing of genetic manipulation. But I digress.

[Soge01]

Garlean Hyur

Yeeeeeeeeeee

[LineageRazor]

Not only is Lucia Garlean, but she's the sister of Livia, whom we killed at the end of Castrum Meridianum. Lucia doesn't hold it against us.

As for whether Hrothgar are "humans" like the other races, until informed otherwise I'm going to assume that yes, they are, and probably just as capable of interbreeding as any other human racial pairing. All player races are basically just variants on humans as we know them. Hrothgar are just a bit further along the "Fine, too" track than the Miqo'te are. :P

[Payadopa]

Maybe I'm completely off here but I thought the lore says that only the mother's race gets inherited. So a female Hyur and a male Hrothgar would still make a Hyur. It's only little things like pointy ears (Hilda) that can get inherited.

[Vahlnir]

Hrothgar may be a grey area. XD
Until we have some lore that confirms or denies the existence of half-Hrothgar half-other-race offspring.
Though it could be theorised that's exactly what Miqote are.

Remember all the races are the result of the original race of the Amaurotine's world being fractured into reflections and the races being fractured along with it.
I don't know what that would make the Amaurotine's true form look like though, some kind of furry dragonoid alien looking species? XD

Hrothgar are humanoids, but that's about it. lol And that's only because of the Hrothgar body largely resembling a buffed up human aside from the head/tail. They definitely fall on the furthest end of that spectrum though when compared to other FF XIV races.

[MikkoAkure]

Technically 'pure-blood Garlean' seems to be more a genetic trait than an actual 'race', as although their usual physical appearence seems to be light skinned, fair haired and takes after midlander hyur in appearence (like Cid, Nero, Lucia etc), there are confirmed situations where there are pure-blooded Garleans with other appearences that resemble different races.

Specifically Nael was long suspected of being elezen (due to using elezen animations) and was confirmed in Second Coil to have an elezen apparence (specifically wildwood with fairer skin) but possessing the pure-blood Garlean third eye. Likewise Gaius was also in SB is revealed to be dark skinned and dark haired, and looks more like a highlander hyur than a midlander like 'regular' Garleans. Both possess the Garlean third-eye.

Nero, Nael, Lucia, Gaius, Maxima, and most other Garleans use elezen bodies with custom heads. Cid and Severa use midlander hyur bodies or at least the skeleton underneath. That's why Cid is so much shorter than Nero and Gaius when they're together. I'd still say Garleans are different enough to constitute their own race.

Maybe I'm completely off here but I thought the lore says that only the mother's race gets inherited. So a female Hyur and a male Hrothgar would still make a Hyur. It's only little things like pointy ears (Hilda) that can get inherited.

This is fanon that is not true and is not in the game at all. I'm pretty sure it was made up by an RP forum and it keeps getting spread around and around to the point people think it's true. The reason for Hilda being a midlander with pointy ears is more to do with the fact that the devs didn't want to make a whole new body for her so they created a custom head with pointy ears and put it on top of a midlander body. Severa's mother is a hyur yet she has a third-eye and Arenvald does not.

According to Koji Fox, the races don't mix much due to cultural taboos and on top of that it seems that they don't seem to be very genetically compatible either. The only mix-races we know for sure exist are hyur+elezen and hyur+garlean. All of the midlander residents of Ishgard have a little elezen in them, then there's Hilda and the baby in Crystarium. And I'm still not convinced that highlander hyur aren't hyur+roegadyn. With all of those at least, the races are very similar-ish to each other and I believe there was an official mention that hyur and elezen have some historical relation to each other. Then there's the legendary yet unconfirmed story of an au ra and a hyur having a child that is missing some scales. Despite miqo'te NPCs being very promiscuous, there is nothing at all for us to go on for proof of hyur+miqo'te babies which tells me those races are incompatible of conceiving, let alone anything else less "human" than a miqo'te.

[TheMightyMollusk]

The only confirmed adult half-breeds we've seen in the game are Hilda (Midlander mother, Elezen father) and Arvenvald (Highlander mother, Garlean father). In both cases, their models are based on their mothers' race. Hilda has Elezen-ish ears, but Arenvald has no obvious Garlean traits. He mentions that his mother kept trying to cut his forehead open looking for a Garlean third eye, but he just has scars there under his facepaint.

[Wyssahtyn]

Maybe I'm completely off here but I thought the lore says that only the mother's race gets inherited. So a female Hyur and a male Hrothgar would still make a Hyur. It's only little things like pointy ears (Hilda) that can get inherited.

Lore doesn't say that. It's just an inference since all the half breeds we've been shown have been like that.

[ClickClick]

Hrothgar may be a grey area. XD
Until we have some lore that confirms or denies the existence of half-Hrothgar half-other-race offspring.
Though it could be theorised that's exactly what Miqote are.

You mean Miqote? /jk

genius! i don't know why seraphor never thought of that

[Packetdancer]

Specifically Nael was long suspected of being elezen (due to using elezen animations) and was confirmed in Second Coil to have an elezen apparence (specifically wildwood with fairer skin) but possessing the pure-blood Garlean third eye. Likewise Gaius was also in SB is revealed to be dark skinned and dark haired, and looks more like a highlander hyur than a midlander like 'regular' Garleans. Both possess the Garlean third-eye.

Nael probably gets a pass though given the Darnus family apparently having a lineage that dates back to the days of Ancient Allag, so their family tree probably got mixed up somewhere along the line, to say nothing of genetic manipulation. But I digress.

In the cutscenes when we see Eula/Nael in her original form and without her helmet on, I could swear she's got Hyur ears rather than Elezen. Am I misremembering? (I'm not in game to go check.)

Either way, the original people of Garlemald are largely descended from the refugees from the Ivalician city of Goug, after that so-called Clockwork City was destroyed and they resettled in northern Ilsabard. From what evidence we have, the people of Goug shared the Garlean handicap inasmuch as they were largely unable to manipulate aether (thus use any magic), hence Goug being a clockwork city of purely mechanical wonders.

So far as I know, the origin of the 'third-eye' that gives them echolocation-ish(?) spatial awareness has never been revealed; whether it's something they had when still living in Goug, or something developed over time in Ilsabard, or something done to them by the Ascians who had been manipulating them, or whatever.