Concept art of the Giant Salamander was created by Shinji Nishikawa, dated 12/11/93. Two diagrams show that the monster's suit would have been operated by at least two people, and would have been able to sit in an upright position. The Salamander was scrapped due to concerns that two aquatic monsters—it and Kaishin Muba—appearing in the same film would be redundant, according to Nishikawa.
Shinji Nishikawa's concept art depicts the monster as a giant version of the real-life Japanese giant salamander (Andrias japonicus), while secondary diagrams incorporate elements from the axolotl.
When Oto Tachibana is introduced, she would have battled the aquatic Giant Salamander and defeated it.
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