[Sunred]

Regarding Ninninger's motifs, the reason we got Harry Potter and Yeehaw Rodeo Cowboy ninjas to name a few was because Toei had Ninninger's concept set as unorthodox ninjas. Adding to this the reason the motifs were all over the place for the robots was because for some reason they decided to "Let's just mash up all the popular motifs from previous sentai shows into one! High Five buddy!", and this part is my speculation, why other than Shinobimaru we had non-ninja-related stuff such as a western dragon, heavy machinery, train, and an animal. It was also an attempt to apply the whole "Cool Japan" movement they had going on a while back apparently focusing on elements such as "budo", "cute stuff" "technology", "Incorporating all things good is the pro of Japanese culture".