Abaddon, Lord of Avernus - Avernus is Latin for "void" or "abyss". Abaddon (Hebrew for "destruction") is the name of the fallen angel of the abyss from the Book of Revelation, which is the last book of the Bible. Is also a powerful character in the miniature wargame Warhammer 40,000.
Aggron Stonebreaker, Ogre Magi - It's name is the name of a pokemon.
Akasha, Queen of Pain - One of the five elements of Hinduism. Also the name of the Queen of the Damned from a book by Anne Rice. Literally speaking in Hindi, it means "sky."
Azwraith, Phantom Lancer - Uses a character model/icon based on a Final Fantasy character, Kimahri.
Banehallow, Lycanthrope - Refers to lycanthropy, the ability or power of a human being to undergo transformation into a wolf.
Barathrum, Spiritbreaker - The name Barathrum is the word for "underworld" in Latin.
Black Arachnia, Broodmother - The name, "Black Arachnia" is a character in the TV series Beast Wars. In the show, Black Arachnia is a female spider/robot for the Predacons faction.
Bradwarden, Centaur Warchief - Centaur character from R.A. Salvatore's book The Demon Awakens.
Jakiro, Twin-Headed Dragon - Background story based on Níðhöggr, a dragon that gnawed at a World Tree.
Krobelus, Death Prophet - A character (missionary role) in the game Summoner 2.Leshrac the Malicious, Tormented Soul - A character from Magic: The Gathering.
Leviathan, Tidehunter - Strength hero that looks like a sea giant. His name comes from a Biblical sea creature. His name can also be from a unique armor in Diablo II, "The Leviathan" Kraken Shell. One of his skills is called Kraken Shell.
Lina Inverse, Slayer (In Dota 2 - Lina) - Powerful spellcaster, whose name and spells originate from Slayers, a famous manga and anime.
Lucifer, Doom Bringer - A Doom Guard, referring to the fallen archangel (the Devil) in Christian tradition. (Also from Heroes Might and Magic Series).
Magnus, Magnataur - A reference to German physicist Heinrich Magnus who described a physical phenomenon called the Magnus effect, that is apt because of Magnus' (the Magnataur's) ultimate Reverse Polarity acting like the Magnus effect.
Medusa, Gorgon - A monster in Greek mythology whose gaze turned people to stone. This is represented in-game using the skills Purge and Gaze (certain versions only) which greatly slows enemies, however does not turn them into stone.
Meepo, Geomancer - A kobold character from Dungeons and Dragons.
Mogul Kahn, Axe - The name Mogul refers to a dynasty of Farsi-Mongolians that once controlled the area that is now Afghanistan, Balochistan, and the Indian subcontinent (e.g. Babur, Akbar), while Kahn is a misspelling of "Khan", which means commander, leader or ruler in Persian.
Morphling, Morphling - A shapeshifter from Wizards of the Coast's Magic: The Gathering, which is also adept at switching stats.
Nevermore, Shadow Fiend- Name is based on Edgar Allan Poe's poem "The Raven".
Puck, Faerie Dragon - Shakespeare's A Midsummer Night's Dream featured a faerie named Puck.
Rhasta, Shadow Shaman - The name is derived from a specific religious group, "Rhastafari," in Jamaica which is where Rhasta's and all the trolls accent places them.
Rikimaru, Stealth Assassin - A stealth ninja in the game Tenchu: The Stealth Assassins.
Shendelzare Silkwood, Vengeful Spirit - Her Magic Missile spell derives from the name of a spell in Dungeons and Dragons.
Slithice, Naga Siren - Derived from Greek Mythology, where sirens (half woman half sea creatures) were enticing men on ships to their island. In the game, her ultimate spell (Song of the Siren) causes all enemies in the surrounding area to sleep for a short period of
time.
Squee, Goblin Techies - Character from Magic: The Gathering; a goblin from the Weatherlight saga.
Yurnero, Juggernaut - An Orc Blademaster who's ultimate ability, Omnislash, is the derivative of Cloud Strife's omnislash from Final Fantasy. Comes from the Hindi Jagann*th, literally, lord of the world, title of Vishnu, and also defined as a massive inexorable force that crushes all in its path.
Zeus, Lord of Olympia - Leader of the gods in Greek mythology. Zeus was the god of lightning, and in DotA Allstars the Zeus hero specializes in lightning-based spells.