Superstar Saga’s Kanji banks

[gentle garnet]

Hi everyone. I’m Unknown G, and I’m occassionally working on a project involving the Japanese version of Mario & Luigi: Superstar Saga (GBA).
I assume you’re aware, but the JP release contains changes and polish missing from the Western one, so I’m trying to analyze the font and dialogue systems in the Japanese ROM — ideally to restore the English script into the more finalized version.
I’ve already tried tools like Tile Layer Pro and WindHex, and I’ve been looking through VRAM with emulators. But locating the full character set (especially the kanji/katakana) is proving tricky.
If anyone here has experience with the game’s data layout, or even knows someone who might… I’d really appreciate any guidance or leads!

[crisp creek]

I don't have experience with that but maybe a different tool can help? https://www.romhacking.net/?page=utilities&platform=10&perpage=20&startpage=1