We could give your characters new weapon systems which are suitable for monetization.
For example, I could add a fire sword for Risa, it is found in Irish/celtic mythology.
Please see the Water Melon Sword we created for Koakuma:
https://www.youtube.com/watch?v=f1VG6ChqV2M
This sword time-freezes the Enemy AIs!
That freezing as such, requires a system to interact with multiple objects in the scene, why we call these Weapon Systems and not just Weapon.
You had mentioned that you liked to develop applications, that Water Melon Sword is an example of an Application.