"Account Basic Service" just the date your Square Enix account was created, nothing more (verified this by looking at my own account history and scrolling back to the start). Although slightly confusingly every time a token was added/removed from my account it also added the line "Account Basic Service", but the only time I have that on it's own with nothing else was the first entry, when my account was created.

Each SE account can have up to 8 XIV service accounts within it (each being a separate subscription) and it sounds like you only have one service account because you said "Final Fantasy XIV" and if you have more than one the first one changes slightly in name to "Final Fantasy XIV 1".

I'd recommend checking the following websites:

Account Page: http://account.square-enix.com/
Mogstation: https://secure.square-enix.com/accou...vc/mogstation/

The accounts page is more for global stuff (not just XIV related, XI and Tetramaster etc show up in it as well as any betas) and the Mogstation is XIV specific.

But it sounds like your other character you're looking for is probably on a different SE account (so different login details). If you have old emails they might be able to give you a clue as to the username and/or the email address you used so you can reset the password etc.