Is it permissible to design children's parties that include a design of a "Tooth Fairy" - whose features are unclear - for decoration, without believing in its existence?

Among the permissible types of animate images are incomplete images from which the element essential for life has been removed, or images with indistinct features that are not clearly discernible. This applies to adults. As for children, the matter is broader for them, and permissibility is more appropriate and evident.