What happened with Kurama? Because he'd probably beat most people he fights against as long as he doesn't do something to screw up (like in that fight against karasu) because he's more merciless than Hiei, insanely smart, and just in general very powerful.
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Nominate Albert Einstein and Adolf Hitler!!!
http://www.gamefaqs.com/boards/8-gamefaqs-contests/60415725#p011