Well for those who know me well, it's pretty obvious I would choose Clank over Vorselon anyday. Sorry Vorselon, you're pretty cool, but not as cool as Clank.
Max Apogee v.s. Kaden
Okay, those two were only mentioned that appeared in little cameos, but they are still existing characters in the series… with interesting slight past stories. :P
Well, we know quite a lot about Kaden from Azimuth, so I'll chose Max Apogee because he's still quite mysterious…
Rusty Pete vs Sigmund
As you all know me very well I go for sigmund over pete anyday I like pete as well but not as much plus pete drinks grog and I hate rum 
I prefer tea just like sigmund 
Dr.N V.S. Klunk
if someone already did this then I'm sorry but I can't think of anything better ^^;
Id say nefarious… he created klunk so he knows how to take him aopart most likely, and it seems has more minions…
Tachyon vs. klunk
sorry i couldnt think of much better either… 
Id say nefarious… he created klunk so he knows how to take him aopart most likely, and it seems has more minions…
Tachyon vs. klunk
sorry i couldnt think of much better either…
Tachyon!
Id say nefarious… he created klunk so he knows how to take him aopart most likely, and it seems has more minions…
Tachyon vs. klunk
sorry i couldnt think of much better either…
Tachyon!
Neffy! You have to pick two other characters after choosing a character from the previous match. This game will not continue if you do not pick two new characters for people to decide on.
But anywho, I'll just pick two new characters to make this game continue on.
Captain Qwark v.s. Gleeman Vox
I'd take Caption Qwark over vox any day of the week.
Clank vs. The Smuggler's Parrot
Id say nefarious… he created klunk so he knows how to take him aopart most likely, and it seems has more minions…
Tachyon vs. klunk
sorry i couldnt think of much better either…
Tachyon!
Neffy! You have to pick two other characters after choosing a character from the previous match. This game will not continue if you do not pick two new characters for people to decide on.
But anywho, I'll just pick two new characters to make this game continue on.
Captain Qwark v.s. Gleeman Vox
I'm truly sorry I forgot 
Anyway, I think Captain Qwark would win. It all depends if Gleeman Vox uses a mech or something. If Vox used a mech like in Deadlocked and Qwark used a ship like in RC1, I think Vox would win.
Heres a pretty cool match
Lord Vorselon v.s. Cassiopeia
EDIT: You and me are up so late, Tipsy! 
Id say nefarious… he created klunk so he knows how to take him aopart most likely, and it seems has more minions…
Tachyon vs. klunk
sorry i couldnt think of much better either…
Tachyon!
Neffy! You have to pick two other characters after choosing a character from the previous match. This game will not continue if you do not pick two new characters for people to decide on.
But anywho, I'll just pick two new characters to make this game continue on.
Captain Qwark v.s. Gleeman Vox
I'm truly sorry I forgot
Heres a pretty cool match
Lord Vorselon v.s. Cassiopeia
What about Rai's choices?
I'd take Caption Qwark over vox any day of the week.
Clank vs. The Smuggler's Parrot
Alright, this is starting to become quite a mess here. Let me choose Rai's versus match first.
Well this ain't no brainer here. I would choose Clank all the way baby! I don't really care about The Smuggler's Parrot to be honest. He can be quite annoying sometimes.
Okay now let's throw Neffy's versus match in
Lord Vorselon v.s. Cassiopeia
Cassiopeia! She could use her feminine charms. 
Mystic VS The Plumber
The Plumber hands down.
Helga vs Libra
Tough choice, but I will have to go with Helga on this one just because she's a more memorable character than Libra. Libra would of gotten my vote if she had more moments in ACIT.
Here's one for you guys…
Tachyon v.s. Orvus
Orvus. His bad jokes would be enough to cause Tachyon to kill himself.
How about..
Hydro Girl vs. Kid Nova
Hydro Girl. She was cool and was more complex looking than Kid Nova. I loved her design.
WHY PERCY?! NO! PERCY! Don't. Go. TOWARDS. THE. PINK. ZONI!!!
Tachyon or Aphelion (aphelion counts right?) LOL.
I wish i could say Tachyon or techneztha…
Tachyon because he's hilarious, especially when he's angry
"somewhere in this galaxy is filthy Lombax secret resposible for the Cragmite defeat, LEAVE NO STONE UNTURNED NO REBELS SPARED
EXTERMINATE ANYONE WHO STANDS IN YOUR WAY!!!
lol
Alistair Azimuth or Courtney Gears.
(I know that's a very odd choice…