OneDumbG0
Find Your Own Fire
I. RESPECT
The Immortal Hercules describes Thor's greatest foes to Masterson Thor and leaves as the "last and greatest of Thor' foes," none other than Loki himself, from Thor Annual #17:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Loki/LokiRespect02aAnnual17.jpg
Dr. Doom concedes that Loki remains "beyond his understanding," from Thor #606:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Doom%20Stats/DoomRespect02TheEnd1.jpg
Befitting his stature and reputation, Loki is both greatly despised and feared. These are just a few examples of the respect he gets from other characters. Here, Dr. Strange describes Loki as an "inconceivable" foe, from Dr. Strange #56:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Loki/LokiRespect01DrStrange56.jpg
The Egyptian God of Death, Seth, would normally be given pause when considering Loki's threats, from Thor #397:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Loki/LokiRespect02397.jpg
Odin has apparently compared the Dread Dormammu to Loki. And Dormammu states that Loki's powers of evil nearly equal his own, from Avengers #115:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Loki%20Stats/LokiMagicPower10Avengers115.jpg
Mephisto himself considers Loki as being "almost his equal in sheer, base villainy." This compliment is not an isolated incident. For Mephisto both admires Loki and considers him a fellow master at villainous games, from Thor #181, 430 and Siege: Loki #1:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Loki/LokiRespect01181.jpg
http://i388.photobucket.com/albums/oo326/OneDumbG0/Loki/LokiRespect03430.jpg
http://i388.photobucket.com/albums/oo326/OneDumbG0/Loki/LokiRespect04SiegeLoki1.jpg
II. STRENGTH
Loki's true strengths lie in his magic. But that does not mean he lacks physical strength. Here, he smashes boulders with his fists, from Avengers #300:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Loki%20Stats/LokiStrength02Avengers300.jpg
Loki smashes a building with a single blow, from Thor #147:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Loki%20Stats/LokiStrength01147.jpg
Loki can, and has, railed Masterson Thor with his pimp-hand, from Thor #441:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Loki%20Stats/LokiStrength03441.jpg
Here, Loki casually tears apart a steel door, from Dark Reign: The Cabal #1:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Loki%20Stats/LokiStrength04DRTheCabal1.jpg
III. DURABILITY
BLUNT
Loki is not known for godly durability, but he does indeed have it. A blow that "would have shattered a small mountain" only dazes Loki, from Journey Into Mystery #108:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Loki%20Stats/LokiDurability00266.jpg
Thor encloses Loki within a million tons of Earth from which Loki obviously survives in West Coast Avengers #55:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Loki%20Stats/LokiDurability06WestCoastAvengers55.jpg
Here, Masterson Thor gives Loki a straight shot to the chin with Stormbreaker. Loki shakes it off immediately to use his sorcery and ensnare Masterson Thor, from Thor #441:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Loki%20Stats/LokiDurability07441.jpg
A barrage of blows from Spider-Man is literally beneath Loki's notice, from Amazing Spider-Man vol.2 #61:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Loki%20Stats/LokiDurability08ASMv261.jpg
Loki takes a shot from Iron Man to the chin and immediately knocks him aside, from Thor vol.2 #81:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Loki%20Stats/LokiDurability10v281.jpg
Loki weathers a barrage of blows from Thor himself with a snarl, from Thor vol.2 #81:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Loki%20Stats/LokiDurability11.jpg
ENERGY
The Norn Queen, Karnilla, the premier sorceress in Asgard, ambushes Loki with a mystical attack and Loki proceeds to weather and counter her attack, from Thor #266:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Loki%20Stats/LokiDurability01266.jpg
Surtur, the Fire Demon, strikes Loki with the fiery energy of Muspelheim, focused by the Twilight Sword and survives, from Thor #353:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Loki%20Stats/LokiDurability02353.jpg
Mandarin's energy blasts are completely beneath Loki's notice, from Avengers Annual #19:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Loki%20Stats/LokiDurability05aAvengersAnnual19.jpg
Apocalypse lures Loki into a Celestial machine from which he promptly escapes, from X-Factor #50:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Loki%20Stats/LokiDurability05aX-Factor50.jpg
Lord Pumpkin, a formidable sorcerer from the Ultraverse, attacks Loki with his Candle of Power and the Roc's Egg, and Loki's only response is "pathetic," from Necromanta/Lord Pumpkin #1:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Loki%20Stats/LokiDurability07aNecromantaLordPumpkin1.jpg
MISCELLANEOUS
Surtur swipes both Loki and Odin with the Twilight Sword itself and they both immediately recover to continue their assault on him, from Thor #353:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Loki%20Stats/LokiDurability03.jpg
The mutant, Rogue, has drained the abilities or Thor, but Loki completely no-sells her absorption powers, from X-Men/Alpha Flight #2:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Loki%20Stats/LokiDurability04.jpg
During the Acts of Vengeance, Red Skull is mystified by this mysterious stranger who gathers the Earth's mightiest supervillains. He attempts to usurp Loki's control over the villains by using the Controller's discs which were upgraded by Thanos. Loki is simply amused by Red Skull's treachery, from Captain America #366:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Loki%20Stats/LokiDurability05CaptainAmerica366.jpg
The Enchantress' magical wiles are also utterly ineffective against Loki, from Thor: Son of Asgard #7:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Loki%20Stats/LokiDurability12SonofAsgard7.jpg
Morwen assaults Loki with a barrage of spikes and he has enough time to lecture Spider-Man about proper honorifics, from Amazing Spider-Man vol.2 #62:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Loki%20Stats/LokiDurability09ASMv262.jpg
Dr. Doom's poisons have no effect on Loki as he is immune, from Dark Reign: The Cabal #1:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Loki%20Stats/LokiDurability13DRTheCabal1.jpg
And Dr. Doom's incinerating chamber is similarly unavailing, from Dark Reign: The Cabal #1:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Loki%20Stats/LokiDurability14.jpg
In his guise as the Scarlet Witch, Loki weathers Vision's phasing attack right through his chest, from Mighty Avengers #29:
http://i388.photobucket.com/albums/oo326/OneDumbG0/Loki%20Stats/LokiDurability15MightyAvengers29.jpg