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If you want to create a hero with a creature figurine, it's simple. In the editor, place any hero, and on the left, there's a "Shared" bar with "...". Click it. There, you can modify the highlighted yellow parameters to your liking. Then, save it (bottom right). Close the editor.
Thank you very much, it helped! And one more question: when I enter a battle, the model is of a regular hero, not the one I set. How can I fix this?