User blog comment:CureHibiki/Mahou Tsukai Pretty Cure! PV is coming~/@comment-25201298-20151227181632/@comment-25201298-20151228030253

I think that's probably the reason why. They probably view it as an "icky" color or a color that won't sell well or something little girls won't like. Idk.

Green can be very pretty and the creators should know that. After all we have 2 green cures already. I'm sure 1 more couldn't hurt.