Among the many Transformers in Hasbro and Takara's massive popular franchise, only a handful tend to receive evergreen focus in the numerous iterations and continuities. Cybertronians that are heavily pushed in one series might be completely absent in another. Add in that some Transformers projects are exclusive to Japan, and the result is that certain robots in disguise are incredibly obscure.
Source：https://www.cbr.com/obscure-transformers-deserve-legacy-figures/
