"How do we know which side that bird is on? Why shouldn't it be leading us into a trap?" "That's a nasty idea. Still—a robin, you know. They're good birds in all the stories I've ever read. I'm sure a robin wouldn't be on the wrong side."
Elves if they are close to Tolkien's depiction (high elves). His idea behind them was to depict a people not corrupted by the Original Sin. The exceptions are settings which say Screw You, Elves!, have elves being another name for The Fair Folk, or feature Dark Elves instead or along with the Lawful ones.
Redwall: Mice, otters, hedgehogs, moles, hares, badgers, squirrels. Shrews are generally Chaotic Good (but always chaotic); voles are good but sometimes whiny.
The eledhel (“elves of light”) in The Riftwar Cycle live in a perfect Hidden Elf Village Utopia with no internal strife. All named eledhel to date have been unfailingly wise, noble and heroic. Notable because in this world, they are the same race as the dark elves (moredhel), who are war-like and hostile, differing only in their mentality and lifestyle. Though it is possible for a moredhel to embrace the eledhel way of thinking and thus Return and become eledhel, the reverse does not happen. Ever. Making this a case of Incorruptible Pure Pureness.
Deconstructed with the Andalites. At first, all we know about them is that they're fighting the yeerks, so the Animorphs assume that all of them are good - Jake even describes them as "the good guys of the galaxy" in an early book. Starting in The Hork-Bajir Chronicles, we see that the Andalites are just as bad as the yeerks, (who were a deconstruction of Always Chaotic Evil), just in different ways.
Played straight with the Pemalites, a highly developed and joyful race that praised life and abhored violence, so much that when the Always Chaotic Evil Howlers arrived, Pemalites failed to muster any defence and were exterminated.
Adventure Hunters: War Golems are a race of Martial Pacifists. Every single one of them abhors violence. If you leave them alone, they will leave you alone. If you attack them, they will wreck you. This is because their personalities are copies of their creator, who was himself a pacifist.
The Organians, and possibly the Metrons, on the original Star Trek. For that matter, most of Star Fleet itself is portrayed as something like this (with a few bad seeds), until the existence of Section 31 was revealed (AFTER Gene Roddenbury' s death of course).
Vorlons in Babylon 5 turn out to be another subversion as they are just as petty and terrorizing as their opposing species, the Shadows; while Kosh was literally Lawful Good (for certain values of Lawful; he had no qualms about encouraging The Chosen One to bend the rules when necessary to maintain long-term order) the Vorlons as a whole turn out to be merely Always Lawful (Ulkesh being definitely Lawful Evil).
The Eternals in Doctor Who were originally intended to be this, although not much is revealed about them in the show and the Expanded Universe depicts them as having their fair share of villains. Some other species, such as Star Whales and Thals, have also only been seen in a positive light.
The Tauren and Draenei—both of which seem to be overwhelmingly honorable on a cultural level—have often been accused of being this (orworse). However, both races have at least a few bad seeds (and representation among Equal-Opportunity Evil organizations).
The Toads and Yoshis in Super Mario Bros.. The RPGs have introduced exceptions, though never quite to the same level of outright villainy as the Koopa Troop.
The Star Sprites of Mario & Luigi are portrayed as benevolent angel-like protectors of the Mushroom Kingdom, even if Starlow, the only prominently featured member of their race, is portrayed as a bit of a Little Miss Snarker.
Deconstructed in, of all things,Touhou. The Celestials are explicitly stated to be Always Lawful Good, since that's the requirement to become a Celestial. However, the only Celestial to be named in the story, Hinanai Tenshi, is one hell of a rabble rouser because she finds herself unable to live up to this standard.
If a race in The Legend of Zelda is made up of NPCs who you can talk to and who don't have danger music playing when you are near them, then they're automatically this. Pretty much the only time they actually become hostile to Link is if they've been forcibly turned into monsters. May or may not be the case with the Zoras, depending on whether or not you consider the pre-Ocarina of Time Zoras to be a separate race.
In Axe Cop, all mermaids are good guys. Unfortunately they had mean and nice facial expression confused, so Axe Cop ended up killing one for looking evil before they cleared up the confusion. He usually does whatever he damn well likes, but this once he was actually subject to My God, What Have I Done?
Snarf's race in ThunderCats are incapable of having evil in their hearts. This makes them immune to Mind Control and other snares without making them unwilling to fight.
Dragons: Riders of Berk: "Animal House" establishes that all dragons have 'protective instincts' for humans and especially their riders. Every 'evil' action committed by a dragon in the series thus far is either: a mother looking for its child, brought on by a toothache, or ignorance that their action was causing trouble.
The Smurfs. They have petty emotions (greed, selfishness, pride, and so on), but they'll end up doing the right thing - even an artificial smurf (like Smurfette.)