If you're hunting for the most complete roster of 'Naruto' characters with detailed bios, I usually point people to Narutopedia on Fandom first. It's massive—every major and minor character usually has a full page with origin, clan ties, jutsu lists, appearance timeline, voice actor credits, manga chapter and anime episode citations, trivia, and often scans or screenshots. The community there keeps entries updated with new databook info and major fan discoveries, which makes it my go-to for quick lookups and deep dives.
That said, I mix sources. For strictly canonical, cited stats I pull up the official 'Naruto Databook' entries (those are gold for heights, ages, and official jutsu notes). For cross-referencing voice actors or translation differences I check MyAnimeList and the official Viz pages. Wikipedia’s 'List of Naruto characters' is handy for a broad overview and simple grouping by village or arc. Personally, I always compare Narutopedia pages with the databooks when I care about exact wording—Narutopedia is comprehensive and fast, but the databook is the final word for official numbers and facts. It’s been my reference for cosplay planning and trivia nights, and it usually saves me from embarrassing mistakes.