I find it hard to choose. Whilst I like the look of Kaiba more in the other season and found him to be more developed... season 0!Kaiba was Midorikawa and he was evil. And I very rarely get to hear evil!Midorikawa! (Given that he's usually the distressed dude and tends to be good at sincere young men/boys.) Also green hair. I feel compelled to vote for him on that insane note alone.