I’ve tried to find Japanese horror games from the PS2 era that has this same feel, but I can’t :(
Some quick facts:
The VAs for Siren were British, so every Japanese person had a posh accent and didn’t pronounce Japanese words so well
Siren 2’s main setting, Yamijima Island, was inspired by an actual Japanese Island, Hashima island. The Island was an industrial hub for coal mining and was known for forced labor involving Korean and Chinese slaves.
Both games used facial scans from multiple angles to create the uncanny, and horrifying, expressions of the various protagonists and enemies
These games were written by the writer for Silent Hill. So if you havent played the original first or second games, those will most likely be most similar.
Maybe Kuon? FromSoft developed game, and a horror game on PS2, but its not got the same unique feeling to it. Just a Japanese PS2 horror game.
I’ve played Kuon. The story line and horror was great, but the combat was very clunky and I felt like the storyline was too vague, if you didn’t pay very close attention. I really didn’t notice the big plot twist until I played through a second time and paid VERY close attention to who was being dragged into the red chest, when, and by who, lol.