>>1454358
The woman with glasses and a mysterious look is Wonder's mom.
Her sprite and Yaoling's (that's the girl below Tomoko) are both used for SMS messages, just like Motoha's
Most of the characters in that sheet are characters you see during the storyline really. If they don't have SMS interactions, it's a matter of time before they get some.

>>1454430
Ah, I haven't played any P5 event yet. I'm still in the first palace, playing at a snail's pace.