The Odinson has had numerous battles throughout his existence ranging from the miniscule to the monstrous and has emerged victorious more often than not. Which of these fantastic foes of Ol' Goldilocks do you most like to see testing the scion of Asgard?
I left Loki out for the obvious reason that no one else can hold a candle against his lengthy antagonism towards his half brother.
SurturFire Demon from Muspelheim and wielder of the Twilight Sword which is foretold to bring upon Ragnarok.
ExecutionerSkurge, half Asgardian and half Storm Giant. A Full pain in the Thunder God's keister.
Wrecking CrewWrecker. Thunderball. Piledriver. Bulldozer. Sharing Asgardian strength and powers, this quartet has often put Thor in a quandary.
KurseAlgrim the Strong of the Dark Elves transformed into a nigh unstoppable killing machine.
EnchantressThe sultry and seductive Amora uses all of her magical abilities and powers of persuasion to gain whatever she wants. And she wants everything.
MalekithThe Accursed Dark Elf of Svartalfheim would like to scour the Nine Realms with the eldritch artifact known as The Casket of Ancient Winters. Only Thor stands in his way.
HelaNorse Goddess of Death and relative of Thor whose desire is to add the Odinson to her Army of the Dead.
DestroyerMindless enchanted suit of armor that is pretty much impervious to any type of damage and will blaze a trail of destruction on the way to it's designated task.

Some other personage? Please. please don't say "The Circus of Crime"!

Anyone else you like? Let us know!