Godlike:
Alucard (Castlevania) vs. Zerase (S5): Kneejerk that Dracula's Half Human son is more powerful than an exceptional Suikomage who does NOT have a True Rune offhand.
X (MMXCM) vs. Mother Brain (PS2): X has beaten Sigma *HOW* many times? And Sigma is not much different from Mother Brain. This is basically the exact kind of fight X was designed for.
Ultimecia (FF8) vs. Raidou Kuzunoha (SMTDSRKs): Can't vote.
Silmeria (VP2) vs. TimeLord (SaGaF): Silmeria isn't particularly strong by the standards of the Gods; again, the Valkyrie were mere Mid Level Gods after all. Someone who controls and manipulates time, meanwhile...yeah.
Heavy:
Alundra (Alundra) vs. Beatrice (WA3): Can't vote.
Axel (KH2) vs. Emeralda (XG): Axl does one thing of plot worth noting...and it takes his life. I'm going with Nano machine freak of nature over that.
Prier (LP:T) vs. Sarah (S3): I don't remember Prier having any REAL plot power, she was just kind of driven to kick some ass. Sarah at least displays strong magic in plot.
Kevin (SD3) vs. Ernst (S5): Kevin is suppose to be one of the strongest fighters in the Beast Kingdom *BEFORE* the whole Mana nonsense. After...yeah. He's not as strong as his dad, sure, but the fact that Lugar had this massive inferiority complex to him even when Kevin couldn't transform into a werewolf should say everything.
Middle:
Ursula (BoF4) vs. Rebecca Streisand (WA5): Ursula's a ranked officer, which implies she's got a fair amount of experience. Rebecca's...nothing particularly special. I suppose she can use Mediums, but eh, those only get so much hype in WA5.
Rikku (FFX) vs. Jessica (MK:AAR): Jessica has Mana and such backing her up, Rikku has...pretty much nothing but Grenades...which Jessica can probably pull out of her bag ON THE SPOT.
Paula (EB) vs. Namine (KH:CoM): Both these characters are pretty pathetic when it comes to fighting. Paula's abilities are primarily telepathy and such in plot, Namine just messes with people's memories. That said, Paula actually fights and has a frying pan, Namine just sits on her chair and twiddles her thuimbs with occassional angst until Sora or Riku reach her. OH YEAH, and she takes like AN ENTIRE YEAR to do anything remotely worthwhile.
Rita Mordio (ToV) vs. Fran (FF12): Hey look, people who may actually work in middle! So much better a fight than the previous one, that's for sure. anyway, Fran's an exceptional archer, so we're to believe, Rita's exceptionally talented at magic. I'm gonna go with the one whose got fireballs that can devastate small legions over sharpshooting for now.
Light:
Dog (Secret of Evermore) vs. Hanpan (WA1): Dog should be in Heavy. The freaking thing becomes a Toaster with MASSIVE LASER BEAMS for crying out loud. Hanpan, meanwhile, is just a rat. A smart talking badass one with awesome Metal Gear Solid skills...but that doesn't help in combat.
Mint (FE9) vs. Princess Peach Toadstool (SMRPG): I'm going to asume you mean Mist. THAT SAID, Peach is Poster Girl of Damsel in Distress in Video Games; she displays 0 plot power in SMRPG even (at least Bowser knocks down a door.) Mist, meanwhile, hangs around with mercenaries and is related to Ike and Greil, so she's probably got some talent with a sword, at least enough to push her above Princess "I get kidnapped by a clear comic relief villain every other game, and exist just to be rescued" <_<
Lowe (ShF1) vs. Skye (Grandia2) I'm going with the guy who actually does things in battles besides lifting an enemy up for Ryudo to hit.
Nina (S2) vs. Shiho (VP1): Shiho's at least skilled in the Arcane arts, and her songs are suppose to have special powers. Nina has a bag...