"Kairi = fighter" is just wrong. The only thing more wrong is "Kairi = Keyblade master." My opinion, of course... but I just can't see it happening. (Ever) That's like having Minnie or Daisy on your team, heh.
"His voice," if you ask me, isn't in reference to Sora's voice, but rather Ansem's voice. Since my completion of Reverse/Rebirth I've been even more confident that this is true. Riku spent his entire journey through Castle Oblivion battling the darkness, and more importantly Ansem's heart itself. He's got one party member already (Mickey), and he's certainly more capable of fighting than Kairi. Kairi may have a strong will, but that's about all she's got going for her. You're all entitled to your own opinions though.
"His voice," if you ask me, isn't in reference to Sora's voice, but rather Ansem's voice. Since my completion of Reverse/Rebirth I've been even more confident that this is true. Riku spent his entire journey through Castle Oblivion battling the darkness, and more importantly Ansem's heart itself. He's got one party member already (Mickey), and he's certainly more capable of fighting than Kairi. Kairi may have a strong will, but that's about all she's got going for her. You're all entitled to your own opinions though.