His works include:
- The Camp Half-Blood Series
- Demigods & Magicians note
- The Kane Chronicles
- Magnus Chase and the Gods of Asgard
- The 39 Clues series: The Maze of Bones and Vespers Risingnote
Under the Rick Riordan Presents imprint, he edits the following series, with more to be announced:
- Aru Shah And The End Of Time by Roshani Chokshi
- The Storm Runner and The Fire Keeper by J. C. Cervantes
- Dragon Pearl by Yoon Ha Lee
- Sal and Gabi Break the Universe by Carlos Hernandez
- Race to the Sun by Rebecca Roanhorse
- Tristan Strong Punches a Hole in the Sky by Kwame Mbalia
- Paola Santiago and the Drowned Palace by Tehlor Kay Mejia
- City of the Plague God by Sarwat Chadda
Tropes common in his works:
- Alliterative Name: His full name, too; it's Richard Russell Riordan, Jr.
- All Myths Are True: In the case of his books, Greek, Roman, Egyptian and Norse mythology co-exist in the same universe. There is also a mention of Jesus and Moses is confirmed to exist, though his characters remain officially agnostic on the existence of a "Capital-G God."
- Apollo references the Aztec gods during his own series, as well as the Chinese and Babylonian. An African Pantheon Demigod also appears in Book 2.
- Cliffhanger: Has a reputation for these (though more often he simply leaves some plot threads unresolved to be built on in later books, which some confuse for this trope).
- Deadpan Snarker: He writes a lot of these. He's also quite the snarker himself, if his Twitter account is anything to go by.
- First Person Smart Ass: He likes this trope and uses it semi-frequently
- Loads and Loads of Characters: Oh yes. With four distinct groups of heroes and their respective villains, this is to be expected.
- Recycled In Space: Though he's pretty clever at it, making the blend of ancient mythology and the modern world complex and entertaining.
- Shown Their Work: Riordan certainly does his research, though he sometimes juggles things around for Artistic License, and the fact that many of the myths have different variations and are often open to interpretations.
- Signature Style: His best known books often put mythological figures in a modern day setting and have a lot of humor to them while still making it a fantasy adventure.
- Sliding Scale of Idealism vs. Cynicism: His books are on the idealistic end of the scale.
- Troll: The fandom is fond of calling him one, due to his penchant for cliffhangers. He takes it well, though.House of Hades dedication page: To my wonderful readers: Sorry about that last cliffhanger. Well, no, not really. HAHAHAHA. But seriously, I love you guys.
- World of Badass: To be expected when the world has four distinct groups of heroes who get involved in epic battles with their respective villains. And that's not even counting the gods, monsters or other creatures, heroes of the past, and non-protagonist characters all with their own (albeit not always as interesting) adventures and abilities.
- World of Snark: Contributing to plenty Funny Moments.