If you’re hunting down 'cat ninja' with English subtitles, I’d start with the obvious legal routes because they usually give the cleanest subs and best playback. Check major anime services first — Crunchyroll and HiDive are top for simulcasts and older shows alike, and Netflix sometimes picks up quirky titles. Amazon Prime Video and Hulu have rotating catalogs too, and occasionally titles turn up on Tubi or Pluto if you don’t mind ad-supported viewing.
If it’s a newer or niche series, look for the official publisher or studio channel on YouTube; some studios upload episodes with subtitles for certain regions. Also keep an eye out for physical releases: a lot of smaller shows get Region A Blu-ray or DVD releases with English subtitles, which is great if you want perfect translations and extras. If you can’t find it on any legal platform, the most likely reason is licensing or a different international title — try searching alternate English/localized names. I always double-check a few listing sites like MyAnimeList or the distributor’s site to verify where it’s officially available. Personally, I prefer streaming from the official source even if it costs a bit more — the subs are usually better and it supports the creators, which feels right to me.