Kind of odd that I'm the one going for the green hair option as I tend to prefer more realistic hair colors and all (silver and white hair being exceptions due to being possible but very rare) but given that Yu-Gi-Oh is designed in such a way that it's obviously not meant to reflect reality as we know it and already has a deformed cartoony style going on, I don't find it that odd as a result. (Also now I'm wondering if Midorikawa has voiced every hair color of the rainbow.... let's see: blue, green, silver, white, black, gold, yellow, brownish red, purple... he's had a long career so I'm guessing there must be a pink haired one somewhere...)