Kaiba/YMMV

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 * Alas, Poor Villain: Well, it's hard to call  a villain, but his motives were definitely less than pure, yet he goes Heroic Sacrifice on us when he finally does die. It goes hand in hand with the Gray and Gray Morality. And then there's  ....assuming he didn't recover his memories after being back-stabbed. The ending wasn't completely clear about that.
 * Complete Monster: Butter, surprisingly enough.
 * Crowning Moment of Awesome: mecha-Neiro. And Kichi.
 * Crowning Music of Awesome / Ear Worm: The whole, freaking soundtrack!
 * Nightmare Fuel: Quite a lot created by the childish art style contrasting with the mature subject matter.
 * Ugly Cute: The little girl with the toy bird in the first episode. You'll either want to hold and cuddle her or recoil in revulsion.