Name:
(Pre mutation) Gojirasaurus
(Post mutation) Gojira (Japanese) Godzilla (English & Latin) Γκοτζίλα (Greek)

Age: 2,608 years old
Born in 600 BC on Odo Island
Was mutated in 1946 at Bikini Atoll (Operation: Crossroads)

(Pre M = Gojirasaurus)
(Post M = Gojira)

Height:
Pre M: 15 meters
Post M: 50.1 meters (164 feet)

Length:
Pre M: N/A
Post M: 100 meters (439 feet)

Weight
Pre-M: N/A
Post M: 20,000 tons

(As a human he appears as a six feet tall muscular Japanese man in his mid 20's)

God Title: God of Destruction & Nature.

Other titles: Titan & Giant Killer (by Zeus), Wrathful God, Vengeful God (by Gaia) , bane of Humanity and Demi-gods, protecter of Earth, King of the Monsters, Spiritual protector (by the Japanese Villagers of Oho island), the disgrace (by Typhon)

Home: Odo Island (a small fictional populated island in the Pacific Ocean off the Japanese mainland and was a military base during the last few months in the Second World War.)

Arch Enemy: Ghidorah (Son of Typhon and Echidna)

Looks:
(Pre mutation 600 BC to 1945 AD/CE) (dinosaur like)

Post Mutation (1946 to present [2009] )

Human form

Abilities:

Post mutation:

Atomic breath (which act like Atomic Bomb going off)

Physical capabilities
Reflexes
Intelligence

Amphibiousness (has gills hidden on his neck so he can breathe underwater, before and after the mutation.)

Durability ( can shrug off attacks without causing any damage to himself even Celestial Bronze does minimal damage to him.)

Regeneration (can regenerate his body after being "killed" or injured or body parts if they are damaged.)

Radiation Contamination
(Black Rain, Radiation Poisoning)

Parents

Mother (the main parent figure)

Tiamat
(In Mesopotamian mythology, Tiamat is a primordial goddess and the personification of saltwater and chaos. She is often depicted as a dragon or monstrous sea serpent, but can also be described as a woman or a body of water. Tiamat is also known as the "Glistening One" and the "mother of monsters.)

Typhon

(Typhon is the son of Gaia (Earth) and Tartarus (the Infernal Regions), though some sources say he is the son of Hera or Cronus. He is also known as Typhaon or Typhoeus. Typhon is described as being tall, with a brutish face, wings, and a lower body made up of coiled serpents. He also has countless snake heads in place of hands, fiery eyes, and can breathe fire. When stretched out fully, his bottom half could reach the top of his head and made a constant hissing sound. Typhon is said to be so powerful that he struck fear into even the Olympian gods and is the "father of Monsters".)

Unofficial sources:

Gojira's father could have also been a Yokai Hōnengyo though if it was true or not is unknown or was lost to time.

Hōnengyo are strange fish or amphibian yōkai which occasionally appear in rivers. They can grow quite to be large—at least over two meters long.

(The similarities between the two (Hōnengyo &
Gojira) are there and not at the same time...)