| Name (1st app in AC) | Description of character |
|---|---|
| Albart of Ancinor (#1) | First Keeper of the Chronicles, follower of Shalako, also known as Albart-Son-of-Yarrow. Committed suicide. |
| Alloroc (#1) | Richest man in Atlantis, father of Bazil. |
| Arion (#1) | Atlantean Demi-god, left Atlantis during the Great Migration when part of Atlantis sank. |
| Atlan (#5) | Second son of Honsu. Discovered the surface, became a great wizard. Fathered Orin and Orm. |
| Atlanna (#7) | Queen of Poseidonis, Wife of Trevis, Mother of Aquaman. |
| Atlantis (#1) | The continent of Atlantis, sank partially during the Great Migration, then completely after being hit by a meteorite. |
| Bazil (#1) | Son of Alloroc, destined to marry Cora. A warlord of Poseidonis later in life. |
| Britton-Son-of-Cole (#2) | Second Keeper of the Chronicles, Nephew of Albart, the first Keeper. |
| Cave of Death (#3) | A cave from which no living thing returns. |
| Cora (#1) | Daughter of Orin and Narmea, born early because of Dardanus's magical intervention. Mother of Fiona and Kordax. |
| Dan (#3) | Tritonian boy who helps save Bazil and Co during the Shark Hunt. |
| Dardanus (#1) | Youngest child of Shalako, son of Loma. Father of Kordax. |
| Dark Gods (#1) | The gods to which Shalako turns when he realizes Suula has forsaken him. |
| Dona (#5) | Friend and companion of Haumond. |
| Duncan (#7) | King of Tritonis during the reign of Trevis. |
| Esteban Maroto (#1) | Illustrator of Atlantis Chronicles. |
| Fatima (#5) | Eldest child of Fiona and Regin. |
| Fiona (#4) | Bazil and Cora's Daughter, heir to the throne. |
| Gana (#5) | Wife of Kalunga. Claimed to have come from the surface. |
| Gulacia (#3) | Flirtatious woman who had an affair with Orin. |
| Haumond (#5) | Third son of Honsu. Killed his brother to end a war, then went into voluntary exile. |
| Helois (#5) | Chronicler of Atlantis during the time of Honsu. |
| Honsu (#5) | Descendant of Manu. King of Atlantis. Attempted to conquer the surface world during his reign. |
| Illya (#3) | The Third Keeper of the Chronicles, younger sister of Britton, One of Bazil's friends involved in the Shark Hunt. |
| Kaladro (#7) | Priest of Shalako, leads the revolution to overthrow science in Poseidonis after Trevis's suicide. |
| Kalunga (#5) | Child of Fiona and Regin, considered an imbecile, might have suffered from hydrophobia. |
| Kordax (#4) | Son of Cora and Dardanus. Completely scaled and green, like a fish, with blond hair. Had his left hand removed for trying to take the throne of Poseidonis. Has telepathy, can control fish. |
| Kraken (#5) | Son of Honsu, Heir. Killed by Haumond in Greece. |
| Loma (#1) | Dardanus' mother, helped Narmea give birth to Cora. Murdered by Shalako to create Tritonis' dome. |
| Lora (#7) | Tritonian child. Finds a container of toxic waste with Uri. |
| Lorelei (#5) | Descendant of Nala, wife of Honsu. |
| Maia (#2) | Wife of Britton (?). |
| Manu (#5) | Child of Fatima. |
| Manuel (#7) | Member of Christopher Columbus's crew who spotted a Tritonian. |
| Morisca (#3) | One of Bazil's friends, involved in the Shark Hunt. |
| Muria (#7) | Queen of Tritonis during the reign of Trevis. |
| Nala (#5) | Child of Kalunga and Gana, one of the most formidable villains in Atlantean history. |
| Narmea (#1) | Wife of Orin, mother of Cora. |
| No-Amun (#6) | Egyptian god, actually a descendant of the first Atlanteans to leave after the sinking of Atlantis. Shared his knowledge with Haumond. |
| Orin (#1) | King of Atlantis, scientist, father of Cora, husband of Narmea, brother of Shalako. |
| Orin [2] (#7) | Child of Atlanna and Atlan, called Arthur Curry and Aquaman later in life. |
| Orm (#7) | The other child Atlan tells Atlanna he will sire. Later known as Ocean Master. |
| Pallais (#1) | Atlantean Sea Goddess. |
| Peter David (#1) | Transcriber of Atlantis Chronicles. |
| Poseidonis (#1) | An inland Atlantis city that survived the first sinkings, only to sink later when a meteorite hits. |
| Professor (Doctor) R K Simpson (#1) | "Discoverer" of the Atlantis Chronicles, writer of several essays at the end of the issues. |
| Rajar (#1) | Advisor and childhood friend of Orin. Murdered by savages thanks to Shalako's deceit. |
| Ramses (#6) | Egyptian leader who spared Haumond's life. |
| Regin (#4) | The Fourth Keeper of the Chronicles, son of Illya, later married Fiona. |
| Ronal (#3) | Tritonian boy who helps save Bazil and Co during the Shark Hunt. |
| Savages (#1) | The people that live outside Poseidonis, who Orin tries to help and who turn on him and the city. |
| Shalako (#1) | Younger brother of Orin, spiritual leader of Poseidonis. |
| Shayera (#6) | The leader of the Idylists, devoted to peace. Leads them to the Hidden Valley and establishes a new home. Warned by Atlan to "Beware of babes with purple eyes". |
| Solon (#6) | Greek traveler and historian, visited Egypt and met Haumond. |
| Stearn (#3) | Chief Magistrate of Tritonis before the re-emergence of Dardanus. |
| Suula (#1) | Atlantean Sky Goddess. |
| Thorne (#2) | An Atlantean scientist who helps discover the serum that allows underwater breathing. |
| Trevis (#7) | Called "The Weak". Last King of Atlantis. |
| Tritonis (#2) | City where Shalako's followers go after leaving Poseidonis. |
| Uri (#7) | Younger brother of Trevis. Finds a container of toxic waste which falls on him, and suffocates him. |
| Viro (#3) | One of Bazil's friends, is saved by Ronal and Dan during the Shark Hunt. |
| Vulko (#7) | The best scientist in Atlantis during the reign of Trevis. |
| Yara (#7) | Poseidonian child. Finds a container of toxic waste with Uri. |