I know another anime Kaiju you could do. Trihexa. From High School DxD. There's no image of it. But A description.: 666 has the appearance of a large beast with characteristics coming from different animals like a lion, a leopard, a bear, a dragon, etc. It has seven necks, seven heads, with ten horns, as well as seven long thick tails of different shapes. It also has four stout arms and two legs that are even thicker than its arms. Its main body is that of a primate leaning forward and is covered in black fur and what appears to be scales all over its body. Its size is well over several hundred meters, making it significantly larger than even Great Red.



The appearance of Trihexa's core is described by Issei and Ddraig in Volume 21 as neither having seven heads or having 10 horns, but having the appearance of a young boy who is able to sprout six wings (bird, dragon, bat, and various other beasts) instead.