Battra

Physical
In an excerpt from the book, Battra is described as being "Slightly larger than Mothra, with large, beady red eyes, and his exoskeleton was pitch black. He had a trio of crown-like horns on his forehead, and his wings were a pattern of red and yellow."

This description matches Battra's previous appearances, but we have yet to see him in a drawing or concept yet.

Roar
Battra's roar is undefined.

In the book, Madison Russel describes Battra's roar as being a "terrible screech that sounded like the cries of a hundred tortured souls, followed by a nerve-wracking clicking sound."

Personality
Battra is described by Mothra to the humans as being "Completely evil, full of hate towards humanity, and will not rest until he destroys all of you."

Mothra, Goddess of Peace (Book)
Battra will go against Mothra in the standalone novel starring Mothra.

Battra's fate after the book is unknown.