“Kaiju No. 8” is a Japanese manga series written and illustrated by Naoya Matsumoto. The title itself does not have an expanded “full form”; “Kaiju” refers to giant monsters typically found in Japanese film and media, while “No. 8” denotes the specific kaiju in the story. The series follows Kafka Hibino, who dreams of joining the Defense Force to combat kaiju but finds himself transformed into a kaiju himself. If you meant something specific by “full form,” please clarify!