Nation Transfer
Use Nation Transfer Scroll to switch between Human and Karus. Learn where to buy it and the nation-matching requirement for CSS characters.
You can use Nation Transfer Scroll to change your character's nation. It lets you switch from Human to Karus or from Karus to Human.
Where to buy
You can buy Nation Transfer Scroll in the Power Up Store.
Nation matching for CSS characters
If you buy a CSS character, the character on the account you want to transfer it to must be of the same nation as the character in the CSS.