since we're narrowing down the amount of fights, there will be only one debate thread.
Bracket 17

Brainiac
Powers: Vast intellect, Superhuman physical capabilities and energy manipulation powers derived from cybernetic body
Vs.

Mandarin
Powers: Fu Manchu moustache, expert in martial arts, 10 alien rings
* Left Pinkie — "Ice Blast," with which he could encase foes in bands of ice or create walls of ice to block pursuers.
* Left Ring Finger — "Mental-Intensifier," which amplifies the Mandarin's own mental energies and allows him to control the minds of others.
* Left Middle Finger — "Electro Blast," unleashing powerful lightning-like bolts.
* Left Index Finger — "Flame Blast," a flamethrower-like gout of flame.
* Left Thumb — "White Light," a laser-like beam.
* Right Thumb — "Matter Rearranger," which can rearrange the atoms and molecules of a substance. The Mandarin usually uses this ring to change the shape of objects, such as causing a giant stone hand to erupt out of the earth and grapple a foe. He has, however, used it to transmute the molecular composition of objects, such as changing the air around a target into a poisonous gas.
* Right Index Finger — "Impact Beam," a blast of concussive or gravitational force.
* Right Middle Finger — "Vortex Beam," allows Mandarin to control air and wind, allowing him to fly.
* Right Ring Finger — "Disintegration Beam." Unlike the others, this Ring requires a twenty minute recharge time between firings.
* Right Pinkie — "Black Light," which can create areas of absolute blackness.
Environment: Oa
Bracket 18

Loki
Powers: Vast magical powers, typical superhuman attributes of Asgardian race such as extended longevity and superhuman strength, great intellect, shape-shifter
VS

Lex Luthor
Powers: Genius intellect, Access to advanced technology
Equipment: Apokaliptican Battlesuit
Environment: Bizarro World.
Posts
Loki's got you here.
As much as I like Loki, don't just write off Lex so easily.
In any case, Luthor's battlesuit makes him far stronger than Loki, because Loki does not posess a significant amount of superhuman strength. He's strong, sure, but he's certainly not even close to being the strongest superhuman in Marvel. He can lift forty tons or something, last I checked, whereas Luthor can wound Superman.
And I agree with Whippy on this.
Still, as things are now, I think that Lex is going to win, hard.
Can either Braniac or Mandarin steal a power ring?
It amuses me to see the Mandarin defeat Brainiac, because they are both so silly, but Mandarin is more so.
As for Loki/Lex, here's something to chew on: Loki is from Marvel, and bizzario is from DC. Unless Loki's status as a god has granted him the ability to some degree of omniscience, he's not going to be familiar with the "rules" of bizzaro world. and as soon as he trys to run from lex and manipulate the natives... well... I imagine it going down like this:
Loki- (to random bizzaro supes) Hello! (Translation in Bizzaro: Goodbye!)
Random Bizzaro- Guh?
Loki- See that guy in the funny suit over there? HE is your enemy, and I am your friend! (Translation in Bizzaro: I'm your enemy, and the guy in the funny battlesuit is your friend!)
(Hilarity ensues)
By contrast, Luther has created Bizzaro clones in the past, and would be familiar with their negative-speak. This fact, plus the prescence of his battlesuit, would be enough to give him a win.
Lex is in serious trouble here. Loki will be able to remove the Battlesuit from play, somehow. Maybe he'll magically screw with the power source, or maybe he'll just wait until lex needs to go to the bathroom.
Mandarin pulls a victory from a near defeat at the hands of Braniac by using his rings to draw power from Oa's Central Battery!
But seriously, why would Brainiac do just that first? He's smarter than Mandirin, and would probably think to do such a thing first.
The powersuit was created by gods in a universe where gods aren't just superheroes, but actually god-like, using technology that might as well be called magical.
I very, very much doubt that a suit so advanced it would stump most of Marvel's (and the non-godly DC) cosmic characters trying to figure it out would be subject to Loki's magical tampering. Especially since the suit is obviously also designed to fight New Gods with, some who have powers that could be called magical.
And Lex, who knows all about Bizarro logic, would be at a distinct advantage over Loki, who still needs to figure out the rules.
And also note that Bizarro World is populated almost entirely by imperfect Superman duplicates, and duplicates of Superman's friends and enemies. That is a whole lot of Superman duplicates. Pre-Crisis Superman duplicates, since Bizarro World only existed back then.
Have a feeling Mandarin would take it, to the surprise of Braniac...but any further battles between the two would always go to Braniac.
As for Lex vs Loki....I was all for giving it to Lex but one variable makes me think this is Loki's fight...BizarroWorld. If anyone can exploit the rules of that world for mischief it will be him. If it comes down to a quick brawl then I'll give it to lex, but otherwise its Loki.
As for Loki vs. Lex... I think I'd give it to Lex, though it won't be a small feat.
Lex is far more familiar with Bizarro World than Loki due to Lex's knowledge of what the hell a Bizarro even is, and what logical pattern they follow. Lex is easily smart enough to use his wits to counter any trouble Loki stirs up using Bizarro World's inhabitants.
On the Braniac/Mandarin front, I've no earthly idea. I think the wuujy cybernetic body and the wuujy rings are a wash, and their both really smart. Can you explain more about Oa? Other than that it has a big@$$ battery?
I mean Lex may be super smart, but Loki's been at it for a long, long time. It can't be that hard to fire up a spell to stop this battlesuit.
Bizarros use backwards logic. They do not need to think about it, they just do it. Bad is good, black is white, up is down, friend is enemy, hate is love, stupid is smart, stuff like that.
And Lex, who knows about Bizarros and how they think, could easily do the same thing to Loki.
I quite agree. Loki has been dimension-hopping many a time, he specializes in impersonating people and things (all gods love to do this) so he is a very quick study of people.
I cannot imagine him being lost or confused in an alien culture for more than 5 minutes.
It's Bizarro World.
It's Bizarro World.
I think that as soon as the fight starts, Loki will dissapear out of sight and blend in. He'll probably then just cause illusions that make regular bizarro residents appear to be loki, then get a sneaky death-blow in on Lex.
Really, though, he wouldn't even need to do that. Loki could just wait until Lex gets a rash from being in that bulky suit for a week or 2, then kill him when he takes it off to apply ointment or some shit.
C'mon, you really think Loki would get knocked out immediately by some random bizarro resident because he walked up to the first one he saw and said "Kill lex! I'm your best friend!"?? Thats not even CLOSE to Loki's style! He's WAY more subtle than that. He's the god of trickery, not the god blunt suggestions, dammit.
Because if not, Lex can still fight them off and probably Loki too.
That's retarded. Loki isn't anywhere near strong enough to do anything to Lex wearing his Apokoliptian battlesuit. If it came to a straight fight, it would be Lex doing the ripping of Loki's head off.
It is made of Apokoliptian technology, and it is incredibly durable, able to withstand an angry Superman's blows. Also, though Lex did need Venom (so it augments natural abilities) and liquid kryptonite to pump himself up to Superman-levels of strength, without it he is stil far, far, far stronger than, say, Loki, who does not posess a very significant level of superhuman strength compared to most superhumans.
And seriously, it was made by gods using near-magic-level technology. I have no idea.
It was given to Lex in an arms deal, for his use, so I guess it's custom, as these suits tend to be.
You obviously did not comprehend what I was doing there.
On Bizarro World, Loki will tear his head off. Is that what you're saying?
Because, seriously, if not that what do you mean?