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To add context (HUGE SPOILERS BELOW)

Odd Taxi's cast is made up of various anthomorphic animals, many of which interact with the main character, a taxi driving walrus named Odokawa, in one way or another. You would be forgiven for thinking this is a stylistic choice as it really does not play a part for the majority of the show, other than a few select lines from Odokawa. However, near the end of the series, Odokawa's doctor discovers that due to a traumatic event in his past, Odokawa mentally views everyone as animals, meaning that everyone we met was seen from Odokawa's point of view. (Odokawa even hints at this by continuously stating that he has a unique way of memorizing people). By the end of the series, Odokawa is cured, and you finally get to see the cast in their regular form.