This adopt was made using an base design that I made, there's only two designs made in this base and there will be no one more :)
You are free to use the characters for personal purposes however you see fit; you can trade or resell them if you wish, and you can also use them commercially in your own works—such as games, comics, or similar projects—without needing to pay me any additional fees (though in that case, I would appreciate being credited in some way as the character designer).