A list of the 25 best anime series is being reported, with some outlets specifying that the series are available on Hulu, while others mention different streaming platforms such as Netflix, Apple TV, or Paramount Plus. The lists may not all be identical, as some outlets have different focuses, such as the best anime of 2021 or essential anime series to watch now. The exact composition and criteria for the lists are unclear, with varying platforms and timeframes mentioned.