Try to name one mahou shoujo that isn't mischievious.
Go on; I dare ya!
The well behaved and the most lovely mahou shoujo around.
Plenty. Umi, for example is a total pill.
Better question: name a MS mascot that isn't mischievous.
I wouldn't say she is mischievous.
Is she even capable of causing mischief?
Are they even capable of mischief?