Zilla Junior

Zilla Junior is from Godzilla: The Series where the beginning of the show is the end of Godzilla (1998) with Zilla getting killed and Niko Tatopoulos finds Zilla Jr and Junior thinks that he's his father and they follow each other around and the Military thinks Zilla is still alive and tries to kill him but, later understands that he's on their side.

Zilla Jr. is very different from his late father. Unlike his late father, who reproduced asexually, Zilla Jr. is sterile (or possibly can only reproduce sexually and a mate simply doesn't exist, since Niko only stated that there was "no risk of him reproducing"). In the episode "End Of The Line", however, he falls in love with a mutant Komodo dragon, named Komodithrax, and becomes surrogate father to her unborn offspring. Unfortunately for Zilla Jr., Komodithrax and the giant egg she laid fell down a crack in the ice and supposedly dies at the end of the episode.

Zilla Jr. is also much more aggressive than his parent; rather than fleeing from an attack, he will usually, like the Japanese Godzilla, fight or destroy his attackers. For a mutation, he is very intelligent and shows the ability to make moral decisions. For example, in the episode "Deadloch", where he fights against the Loch Ness Monster, he then later aids Nessie in recovering her stolen baby (this is when Zilla makes a "moral decision", although H.E.A.T. member Monique says that it's just instinctual for creatures to work together). In Monster Wars part 3, he decided Niko Tatopoulos is better father than Cyber-Zilla and fought him.

Zilla Junior also shows some planning and strategy in his fighting style, though it is shown that he can resort sheerly to brute force, if he is angered enough. He has even shown a sense of humor, (much like Godzilla in Ghidorah, the Three-Headed Monster) as in the climax of one episode of the series, he splashed members of the H.E.A.T. team with water in a playful fashion.

His most prominent trait, though, is his protectiveness and loyalty towards Dr. Nick Tatopoulos. When Nick is journeying around the world, Zilla Jr. is never far behind. The proof of this is that Zilla Junior has often saved Nick and other members of the H.E.A.T team from dangerous situations. In one situation in particular, Zilla Junior managed to catch Nick (who was falling) on top of his head before letting him down gently. The only time Zilla Junior's loyalty faltered was when he met his biological father, Cyber-Zilla for the first time. He can be seen cowering in fear not unlike a little boy being scolded severely by his father when Cyber-Zilla roared at him. He also unwilling to attack his own father despite being told by Niko to do so. Niko then sadly said that Godzilla has "dumped" him for his birth parent.