So, easy question: which of these Hero's is greatest. And this is of course based on main quest + expansion main quests. My own favorite will probably be Dragonborn, since after all, he beats god and Nerevarine being close second.
Also, here is little list of what everyone of those did, straight from UESP wiki:
Talin, the Hero of Arena (better known as the Eternal Champion)
Born in 3E 370[3], the hero reconstructed the Staff of Chaos and rescued Uriel Septim VII from his imprisonment at the hands of Jagar Tharn.
The Hero of Daggerfall (better known as the Agent)
Born in 3E 375[3], the hero was sent as an agent of the Empire to exorcise the spirit of a dead king, but ended on a quest that would change all of northwestern Tamriel.
The Hero of Battlespire (better known as the Apprentice)
Sent to the Battlespire to make way for the Shadow Legion, the hero found the spire captured by Mehrunes Dagon, and had to battle an army of daedra to rescue their companion.
Cyrus, the Hero of Redguard
Cyrus returned to Stros M'Kai to find his missing sister, and ended up leading his fellow Redguards in a rebellion against the empire.
The Hero of Morrowind (better known as the Nerevarine and the Blodskaal)
The hero was sent to Vvardenfell as a prisoner of the empire to fulfill a prophecy. As destiny unfolded, the hero battled against living gods, and then, in the frozen wastes of Solstheim, against the champions of Hircine.
The Hero of Stormhold (better known as the Master Tunnel Rat)
The hero was sent to Stormhold prison, where they were forced to clear the underground ruins in search of crystals. The hero slew the Mad Warden Quintus Varus, and used the Storm Crystal to remove the evil from the mining camp.
The Hero of Dawnstar
The hero was sent to the exile post of Dawnstar, which was besieged by the Ice Tribes. The hero revealed which of the town's champions was a traitor in league with the tribes, and emerged victorious from the ensuing battle.
The Hero of Shadowkey
The hero's destiny began when their home village of Azra's Crossing was attacked by bandits during the War of the Bend'r-mahk. The hero becomes entrenched in the war, and learns of an evil incarnation being created with shadow magic and the conflict caused by the ongoing war. This Shadow of Conflict, or Umbra' Keth, was sought by Jagar Tharn and Pergan Asuul for their own ends. The hero gathered the seven Star Teeth and destroyed the monster.
The Hero of Oblivion (better known as the Hero of Kvatch, Champion of Cyrodiil, Divine Crusader, and Madgod of the Shivering Isles)
Released by chance from prison in the Imperial City, this hero's tale began as a courier for Uriel VII and ended in the salvation of all Tamriel from the forces of Mehrunes Dagon. The hero saved Tamriel again by reuniting the Relics of the Divine Crusader, defeating Umaril the Unfeathered, and even visited Sheogorath's realm of insanity to battle the daedric prince and end an eons-long cycle of order and chaos, becoming the new Sheogorath, Prince of Madness.
And then of course Dragonborn, who beats Alduin.
So, discuss