Five Races: Not terribly true for the Eldraeverse; for one thing, there’s a lot more than five species out there. A lot more. But let’s look at some archetypes, here:
Stout (Dwarf): One of the few that does have an obvious candidate, the pseudosaurian kaeth, whose physical strength and resilience, militaristic philosophies, and rather, um, kinesthetic way of life fit the bill to a T. (The deeply spiritual and artistic aspects of their culture don’t, so much, but never mind those.) They also wear the Proud Warrior Race hat, or one of them – it’s not like there’s a galactic shortage of Proud Warrior Races, after all.
Fairy (The Fair Folk): The most likely candidates for this hat are the various elder races (i.e., the Precursors that are still, to some degree, around), which by and large are alien and incomprehensible and to be kept out of the way of at all times.
It could also be argued that the Imperials wear this hat, but honestly, I think they’re more High Men. But if not, the galari (ancient – even by the standards of the Empire – and immortal sophont rocks) are actually a much better fit than the eldrae in terms of being ancient, wise and benevolent, and – as Imperials – Sufficiently Advanced by many standards.
Mundane (Human): Everyone wears this hat, or, at least, something within delta of everyone. After all, even if it doesn’t look that way from the news, or the plots, the majority of species within the Associated Worlds are, by and large, regular folks just trying to get along, earn a living, make a little difference and have a little fun. The ones actively engaging in war (or other, ahem, dynamic ideological praxis), galactopolitics, galaxy-spanning plots and schemes, uplifting programs, radical transsophontism, even madder science, personal apotheosis, computational theogeny, or applied theological engineering are the distinct minority, even if they do get more press.
High Men (Taller Elf or Human): This is where I would put the eldrae on the grounds of (a) transsophontism, and (b) literary inevitability.
Cute: Possible candidates here include the myneni – silicate-based shapechanging blobs, who can invent new organs on the fly, directly interface with computers, and construct all manner of useful things with their own secretions.
The esseli, who despite an extensive history of bioengineering themselves to the point that no-one, even themselves, actually remembers what they originally looked like (they’re currently brain-filled fleshy ovoids with short manipulating tentacles – for the most part) nonetheless manage to appear as cute. Treating them as just cute would be a really bad idea, given that they’re an entire species of mad biologists, who are even as you speak contemplating how to better engineer your organs, but hey, it’s a mistake you’re only likely to make once.
And the dar-bandal, who are canine uplifts, who inherit this just because we’re prone to think of the furry as the cute, right? Some people find out the hard way that condescending to someone descended from wolves by way of bred-for-brains dog-pluses is a good way to get said condescension bitten right off. The rest have found one who’s more than willing to give you a big goofy grin and the winsome puppy eyes while taking you for everything you’ve got. Truly, their social-fu is strong.