Ok I'll try and answer that even though my brain aint working right right now. Heck, if you've ever seen the making of Berryz photobook in Hawaii, Miyabi will give you at least 6 or 7 examples.
Stealing Momoko's blizzard or whatever the heck is was, having a look on her face like she wants to kill people, trying to kill Chinami,
there's alot there. HECK, when I met Berryz at Sakuracon Miyabi signed my brother's poster all huge, and Maasa looked at her like, where am I supposed to sign and Miyabi's starts pointing at Maasa's face in the picture with a, just sign it there don't bug me attitude. It was so funny. Every one of them said "hi" to me first except for Maasa because she was so flustered by what went down.
Anyway, I aint gonna act like I know them, cause they're idols and it's a fantasy world, but I'ma guess Miyabi is one of them girls thats pretty cool and is nice but can go from zero to bitch at the drop of a dime. Which is freakin awesome. She's easily in my top 3 current H!Pers.