Are There Hidden Characters in Naruto Senki?

Hi everyone,

I’ve been exploring https://narutosenki.net and saw that some players mention hidden or secret characters in Naruto Senki. I’m wondering if that’s actually true.

Do you have to complete special missions or use cheats to unlock them? I’d love to access characters that aren’t visible in the default list. If anyone has a step-by-step guide or any hints, please share! I’m really excited to unlock the full roster.

Thanks in advance!