It is a green mutated Tyrannosaurus (and sometimes appears in red-violet and lilac) with rounded, blue spike-like appendages on its back, which intentionally causes it to resemble and spoof Godzilla.

Reptar is portrayed as being a fictional character in the Rugrats universe idolized by a majority of the children featured in the series, particularly Tommy Pickles and his friends.

A gigantic green, Tyrannosaurus rex-like kaiju, Reptar's popularity as a character is noticeably akin to that possessed by Mickey Mouse, although his role is similar to Godzilla.

It was made like a high-tech car that can do various things such as talk and turn into a boat (Aqua Reptar) when in water and has fire breath.

A normal-sized Reptar also appears as a playable character in Nickelodeon All-Star Brawl and its sequel,[12] with Fred Tatasciore reprising his role from the 2021 series.

"[16] Reptar was also included at Alternative Press on their "most metal cartoon characters", by stating that "This fire-breathing beast is loved and admired in playpens far and wide for his badass heroics throughout the Rugrats series and movies.