I kind of thought dragon but it in truth i wasnt really sure what he is, I just call him a 'shibu' and he is almost a species of his own. I can see why you would think that though
I also thought of an angelic and demonic version of them. I never doubted they would be cats tho, especially because of the 'ears' pose you can put on. They're definitely cat ears.
Maybe they just wanted other poses, cause they couldn't think of what to put on avatars. xD So Unihorned Cat Dragon Creature was the only thing they thought of? o__0 Only Ernii would know. x_X