This is my final sketch of toy concept. I decided to make castle theme and using nutcracker mercenaries. So Idea in here was that if a user hit a board, which is located at the back of the castle, then the character inside the building fall off and other character (Basically it is same character) will come out from the door.
I built a simple mechanism that needs just three actions.
1. Drag it
2. Fix it
3. Shoot it
This is my first model of front door of castle.