interact with several other functionalities found on the website.
(¹) Only the main forum boards can be accessed.
(²) It's technically possible to send messages and post forum comments using the API, but the recent introduction of Google reCAPTCHA made it impossible to perform such actions in an automated manner.
(³) The characters and people endpoints exist but are undocumented and under active development. Don't use them.
The MyAnimeList API will, at some point, add a characters and people API. See https://myanimelist.net/forum/?topicid=1973141&show=0#msg64959633