Aethersx2 uses the following file formats and locations for saving data:
You can find 100% completed save files that unlock all 62 characters through various online resources: Video Guides with Links save data naruto ultimate ninja 5 ps2 aethersx2
Complete Save Data Guide: Naruto Ultimate Ninja 5 for AetherSX2 (PS2) Aethersx2 uses the following file formats and locations
Search for a "Naruto Shippuden Ultimate Ninja 5 100% save" on sites like GameFAQs. Ensure the save region matches your game. PAL (European) saves work with PAL ISOs. NTSC-J (Japanese) saves work with Narutimate Accel 2 ISOs. save data naruto ultimate ninja 5 ps2 aethersx2
This is where most players fail.
You need a specific file type. Googling the raw keyword will bring you to shady forum links. Here is what to look for: