Not Serious - A Japanese-based site that has a lot of rare information. This site includes character biographies, book and CD lists, complete game scripts and in-depth game studies. Japanese and English versions. - http://notserious.info/
Purity - Fansite dedicated to Rosa Farrell. Offers information and media. - http://december-rain.org/rosa
The Paladin's Chronicles - Offers general information, FAQs, character biographies, item and magic lists, cheat codes, art, and an extensive gallery of screenshots. - http://ff4.paladinet.com
Caller--A Tribute to Rydia of Mist - A Rydia shrine that includes the character's story through the game, personal game statistics and an image gallery. - http://magitek.nu/rydia/
Final Fantasy IV -- Sygnus.org - A US fan hub that includes fan-created art, poetry, fiction, and humor. It also features an oekaki, fan novel and hand-drawn fan manga/doujinshi. - http://www.sygnus.org
Mike's RPG Center - Features lists of weapons, armor, items, magic, and enemies as well as maps and a walkthrough. - http://mikesrpgcenter.com/ffantasy2/index.html