Apparently the only two games that have multi league support are 1 and 4. I only played 1 for half an hour in school when a friend brought in his, at the time, kick ass new PS2 to math class so I’m playing it right now, since I popped in the disc to check for languages settings. OniMusha 1 does have English/Japanese settings. No Spanish but I guess I can deal.The only game in the series I've tested it with is Dawn of Dreams, but it should be there in the options somewhere. Gaijin Gamer states that all the Onimusha games have this option. Just cycle through the Options until you find the Kanji character for "Eigo" or "English language" which looks like this: 英語
I contacted Capcom to ask them if it’s possible to play the game with English text and Japanese audio. Any version that supports it. The most likely possibility, I’m guessing, is going to be the Asian PC version, but I finally found a play through in Japanese and that is not Jean Reno speaking Japanese, like, blatantly clearly not him. I also don’t think there’s a French dub so Reno’s part might be the same in every version. Just those few lines.
On topic. PSX is in less than a month so maybe a bit of gameplay will tell us if we should be exited or not.