Board Thread:Off Topic/@comment-11276487-20140524145048/@comment-1470368-20141112151833

Here's how I would rate/level the various Player-Characters ("Heroes"), below.

From 100 to 255 (the highest NPC level in any Elder Scrolls game)  NOTE:  I'm not going to lie about there being no bias here in the list, but this is all honestly what I think.

(TESO) The "Soulless One"/Vestige:  Level 225 (For being at least powerful enough to survive large-scale battles in the War for the Ruby Throne without his/her Soul, surviving arduous tests, helping defeat Mannimarco and other monstrous threats, aiding a Dragonborn Prophet...and for facing off against Molag Bal himself, albeit with some divine aid)

(TES Adventures: Redguard) Cyrus the Redguard Mercenary:  Level 210 (For potentially being one of two individuals other than Prince A'Tor who was part of the "HoonDing" in his time, and for managing to both defeat a Sload Necromancer as well as slaying a Dragon all by himself.  He likely hadn't realized his full potential...)

(An Elder Scrolls Legend: Battlespire) The "Apprentice"/Last Battlemage of the Spire:  Level 235 (This hero, with access to powerful magic, was forced to do battle with armies of powerful "lesser" Daedra all to rescue a companion of his/hers who was lost in one of many Planes of Oblivion that needed to be explored, including the Shade Perilous & Soul Cairn.  At the end, the Battlemage managed to banish Mehrunes Dagon from the Spire, making the Eternal Champion's task of saving Tamriel a little easier)

(TES Travels: Shadowkey) The "Soul of Conflict":  Level 235 (For this character's encounters with Shadow Magic, and his/her efforts to defeat the Shadow of Conflict/"Umbra' Keth" strengthened by the War of the Bend'r-mahk.  His/her wielding of Shadow Magic, in the form of "Shadow Keys", could've potentially made the character even more powerful than ever...considering that the character ends up being powerful enough to defeat an exceptionally powerful Shadow Mage in battle.  This hero ended up destroying the Umbra' Keth with the power of the seven "Star Teeth" that he/she gathered)

(TES: Arena) Talin, the Eternal Champion:  Level 255 (Through constant self-improvement, as well as conquering challenges in every single Province of Tamriel.  He/She would face off against Jagar Tharn after the latter empowered his already great magical talent with the nigh-indestructible Staff of Chaos' power...a staff of incredible power that can easily obliterate all manner of living things; mortals, creatures, monsters, and perhaps even undead & lesser Daedra)

(TES Travels: Stormhold) The "Master Tunnel Rat":  Level 150 (For being empowered by Ayleid artifacts known only as "Stormhold Crystals", and for his/her successful attempt at stopping literal corruption from spreading due to an insane man's attempt to create more powerful crystals)

(TES Travels: Dawnstar) The Hero of Dawnstar:  Level 150 (For valiantly facing off against the "Gehenoth Thriceborn", a powerful unique monster proven to be able to easily outmatch the mortal might of any Nord who tried facing it head-on...possibly on the level of more-powerful lesser Daedra.  The "Starfrost" was a unique weapon given to the Hero, powerful enough to give him/her a chance against the Gehenoth)

(TESII: Daggerfall) The Agent/Hero of Daggerfall:  Level 230 (An agent originally sent to exorcise the spirit of King Lysandus, finally putting him to rest.  However, the Agent ended up on quest that would decide the future of the Illiac Bay region, or arguably all of Northwestern Tamriel.  This led him/her to even brave the dangers of the Adamantine Tower, and to retrieve an object of incredible power capable of powering the God-Machine "Numidium".  It is possible that to emerge a survivor of the infamous Dragon Break known as the "Warp in the West", wherein the Agent is killed in a couple possible outcomes, actually made the Hero of Daggerfall more powerful than before...and likely gave the Hero a permanent connection to the Numidium)

(TESIII: Morrowind) The Nerevarine:  Level 255  (For facing "gods" who relied on an ancient divine artifact for their power, granting them near-invincibility...also for facing the Aspect of a Daedric Prince in single combat.  He/She is also a Daedric Champion of a certain Prince)

(TESIV: Oblivion) The Hero of Kvatch/Champion of Cyrodiil:  Level 255 (For rising from a nobody to an empowered hero who helped save the world from Mehrunes Dagon, killed Mankar Camoran and his immortal followers single-handedly, as well as defeating two other god-like threats...also possibly ​becoming the new "Sheogorath")

(TESV: Skyrim) The Last Dragonborn:  Level 225 (This hero is arguably only the 3rd most powerful Dragonborn, after Miraak and Talos respectively.  This Dragonborn did manage to defeat Alduin the World-Eater, but we must also take into account that Alduin was previously weakened, primarily due to the neglect of his true purpose & his now-apparent hunger for Souls.  As Alduin can't be killed, we can't say that this Dragonborn is any more powerful for it, and only became more powerful than before due to Miraak's death at the hands/tentacles of Hermaeus Mora.  This Dragonborn is now an unwilling "Champion" of Hermaeus Mora, replacing Miraak)

All in all, the three most powerful Heroes of the Elder Scrolls series (in my opinion) are: The Eternal Champion, The Nerevarine, and The Hero of 'Kvatch'.

^Cyrus, The Soul of Conflict, and the Agent of Daggerfall all have the potential to rival them though. Maybe even the Soulless One...but I personally doubt it. :P