How interesting is Poppy? Or Heather?

Poppy is a 5* Slice type with 100% counter attack and +10% ATK for whole party. With a damage to all ennemies skill. And she is draw by the same artist as Kerria.

Heather is a hit girl with a broom and heather as flower. She also as x1.2 skill activation and +10% ATK. She is a bit my secret waifu after Alstroe Maria.