- Possessed Klug's back story, it's incomplete and we don't even know what he's like at full power, or even what he looks like.
- Sig's secret drops a hint at how the original demon might have looked like - when Sig's demonic power is out of control, he ends up having both eyes and arms red, and with purplish-blue hair.
- What creature Lidelle actually is?
- How exactly do skeletons drink tea?
Headscratchers / Puyo Puyo