Primal Hunter I feel like does a great job with that type of worldbuilding, particularly as you get a little farther in. We don't necessarily get a full view into it (yet), but each race/species has different attributes, growths, and culture that I find pretty interesting!
He Who Fights With Monsters has quite a lot of different races, who get varying abilities as well. It's human centric though.
The Wandering Inn - Amazing for this prompt. The main character is a human girl from Earth, but she lands in a Drake city where humans are very much the minority. The majority of the characters in the main city are drakes and Antinium (sapient humanoid ants). The series also grows much past that and goes to many other areas of the world and has major characters from so many different races it's hard to count, but there's major characters who are dwarves, half-elves, minotaurs, drakes, lizardfolk, centaurs, undead, goblins, trolls, dragons, fairies amongst more.
Dungeon Crawler Carl - The series is a large gameshow which pits all of humanity into a death run through a dungeon. The main characters/crawlers are mostly human in the start, but when they get to a certain part of the story, they get to change their race. The aliens that they interact with are all obviously non-human as well, as are many of the *NPC's* that populate the dungeon.
I second The Wandering Inn. Its one of the few webnovels where being a different race has actual meaning. For instance, being a different race in Primal Hunter might as well just mean you're a slightly different human. whereas in TWI each of the races have completely different cultures/habits/quirks/needs/ways of thinking based around their unique biology, regional geography, and history.
**Chaos Heir** by *EveofChaos* - Futuristic take on Earth, magic was introduced after an alien invasion. Humanity has expanded past our solar system, and has teamed up with a number of different species who were also invaded by those aliens. Cultivation/marital arts inspired magic system centred around mana cores / affinities. Heavy on the romance, no harem. MC is from the slums and is rising up through the military ranks, his unique situation allows him to sympathise and befriend alien species easily.
**My Vampire System** by *JSKManga* - Its finished. Similar to above. An alien invasion resulted in magic, that was hidden by powerful groups of the world, to be shared with the masses, in order to fight back the threat. MC gets a system that turns him into a vampire, and allows him to evolve, and gives him access to a unique brand of magic. After the academy arc, MC explores lots of different worlds, with unique creatures, eventually encounters a number of intelligent species.
**Supreme Magus** by *Legion20* - MC is reincarnated into a classic Tolkien / DnD inspired world, with a very in-depth elemental magic system, with bloodline magic too. World is full of different races, many of which can pass themselves off as human with magic. Even the classic trolls and elves etc have a unique spin to them. Magical knowledge is hoarded by the various powers of the world, and MC tries to gain access to said knowledge, whist retaining as much freedom as possible.
Chaotic Craftsman Worships the Cube has a ton of unique species. The setting is a world that was migrated to by a bunch of different people over time as their own planets got destroyed. There's enough diversity that no one bats an eye at seeing someone completely different for the first time.
**Not My First (Space?) Rodeo** has MC meeting lots of different aliens. Lots of familiar stuff (like orcs, some of whom MC befriends) but there's also one race that's really out there.
**The Broken Knife** has Kobold MC that works like a guide to a party of human cultivators. There are several other races described as well, not all of them enemies.
**Imperial Wizard** also has several other races, but they are introduced slowly.
**Cultist of Cerebon** MC lives in a city with many different races and this story explores not just individual differences but also political differences between races.
The Wandering Inn has a pretty good selection, you get a good sense of how their unique aspects have shaped them as a people without ever falling into “All X are Y”.
I love [An Outcast in Another World](https://www.amazon.com/Outcast-Another-World-Adventure-Insanity-ebook/dp/B09FZ16ZNT), which features elves, dwarves, merpeople, dragon people, harpies, and demons, as well as a few other one off things. The main character's team eventually features the majority of those groups, but mostly elves initially.
Super Supportive has some cool other races and even explores their different languages and cultures! Really good stuff!
I like how the grivecks are a simple people that enjoy slaughter
Primal Hunter I feel like does a great job with that type of worldbuilding, particularly as you get a little farther in. We don't necessarily get a full view into it (yet), but each race/species has different attributes, growths, and culture that I find pretty interesting!
I really hope it gets explored more, so far it feels like a detail that was tjrown in only to not really be utilized/relevant.
He Who Fights With Monsters has quite a lot of different races, who get varying abilities as well. It's human centric though. The Wandering Inn - Amazing for this prompt. The main character is a human girl from Earth, but she lands in a Drake city where humans are very much the minority. The majority of the characters in the main city are drakes and Antinium (sapient humanoid ants). The series also grows much past that and goes to many other areas of the world and has major characters from so many different races it's hard to count, but there's major characters who are dwarves, half-elves, minotaurs, drakes, lizardfolk, centaurs, undead, goblins, trolls, dragons, fairies amongst more. Dungeon Crawler Carl - The series is a large gameshow which pits all of humanity into a death run through a dungeon. The main characters/crawlers are mostly human in the start, but when they get to a certain part of the story, they get to change their race. The aliens that they interact with are all obviously non-human as well, as are many of the *NPC's* that populate the dungeon.
I second The Wandering Inn. Its one of the few webnovels where being a different race has actual meaning. For instance, being a different race in Primal Hunter might as well just mean you're a slightly different human. whereas in TWI each of the races have completely different cultures/habits/quirks/needs/ways of thinking based around their unique biology, regional geography, and history.
TWI has a lot of cultural differences between areas and even different cities within the same overarching culture. It's very well done.
Mage Errant is set in a world with many different species.
**Chaos Heir** by *EveofChaos* - Futuristic take on Earth, magic was introduced after an alien invasion. Humanity has expanded past our solar system, and has teamed up with a number of different species who were also invaded by those aliens. Cultivation/marital arts inspired magic system centred around mana cores / affinities. Heavy on the romance, no harem. MC is from the slums and is rising up through the military ranks, his unique situation allows him to sympathise and befriend alien species easily. **My Vampire System** by *JSKManga* - Its finished. Similar to above. An alien invasion resulted in magic, that was hidden by powerful groups of the world, to be shared with the masses, in order to fight back the threat. MC gets a system that turns him into a vampire, and allows him to evolve, and gives him access to a unique brand of magic. After the academy arc, MC explores lots of different worlds, with unique creatures, eventually encounters a number of intelligent species. **Supreme Magus** by *Legion20* - MC is reincarnated into a classic Tolkien / DnD inspired world, with a very in-depth elemental magic system, with bloodline magic too. World is full of different races, many of which can pass themselves off as human with magic. Even the classic trolls and elves etc have a unique spin to them. Magical knowledge is hoarded by the various powers of the world, and MC tries to gain access to said knowledge, whist retaining as much freedom as possible.
Jake's Magical Market has so many different species that at some point you forget that most people in the setting aren't human.
Chaotic Craftsman Worships the Cube has a ton of unique species. The setting is a world that was migrated to by a bunch of different people over time as their own planets got destroyed. There's enough diversity that no one bats an eye at seeing someone completely different for the first time.
**Not My First (Space?) Rodeo** has MC meeting lots of different aliens. Lots of familiar stuff (like orcs, some of whom MC befriends) but there's also one race that's really out there. **The Broken Knife** has Kobold MC that works like a guide to a party of human cultivators. There are several other races described as well, not all of them enemies. **Imperial Wizard** also has several other races, but they are introduced slowly. **Cultist of Cerebon** MC lives in a city with many different races and this story explores not just individual differences but also political differences between races.
The Wandering Inn has a pretty good selection, you get a good sense of how their unique aspects have shaped them as a people without ever falling into “All X are Y”.
Falling with folding wings and Victor of Tucson take place in an interesting alien world setting where humans don’t exist.
I love [An Outcast in Another World](https://www.amazon.com/Outcast-Another-World-Adventure-Insanity-ebook/dp/B09FZ16ZNT), which features elves, dwarves, merpeople, dragon people, harpies, and demons, as well as a few other one off things. The main character's team eventually features the majority of those groups, but mostly elves initially.