Make sure the work, character, actor, or staff isn’t already in the database.
You can check by running English, native language, and romaji titles through the search and browse sections, as well as going through the credits of relevant staff and characters.
Always include as much detail as possible, as well as link to as many sources as possible in the sources panel (even if it is in a language you can’t read).
If you find a duplicate entry, contact a moderator.
The nationality of a creator does not matter if their work is first professionally published by a reputable Japanese, Chinese, Korean, or Taiwanese publisher for their respective markets (See Country Of Origin). Example: