To play The Elder Scrolls® Online on your PlayStation® or Xbox®, you need to link your PlayStation™Network or Xbox® account. You can link both a PlayStation™Network and Xbox® account, but no information (characters, progress, etc.) will be shared between them--the accounts are entirely separate. You can unlink your console accounts at any time and re-link them later if you choose.
To play The Elder Scrolls® Online in Japanese, you need to link your DMM Games account.