Regarding character name restrictions.

[Jessikia]

At a guess I would be inclined to think it's because you are trying to use your account name. Personally, I wouldn't name a character after my account name anyways, due to the amount of accounts that are being hacked...

[worldofneil]

Sorry if I've misunderstood (and I have no idea what your account name is, nor do I need to know what it is), but all characters have to have a first name AND a last name (and to the best of my knowledge the account name doesn't allow spaces in it).

Again I apologise if I've misunderstood, but if you're trying to create a single name only, that won't work, you need both first and last names.

[Dburwebby]

Sorry if I've misunderstood (and I have no idea what your account name is, nor do I need to know what it is), but all characters have to have a first name AND a last name (and to the best of my knowledge the account name doesn't allow spaces in it).

Again I apologise if I've misunderstood, but if you're trying to create a single name only, that won't work, you need both first and last names.

Well for example if my account name is "Aids" and I put Aids in the first name field and whatever in the last name it will not work. However if I put Aidds (pretty much spell it incorrectly) and whatever last name, it will work. So the problem is with using the name that's the same as my account name. So far it seems like it won't let you use it but I'm just guessing, I wish Square Enix had an official statement regarding this so I know for sure. Or if there would be a way to change the name of my Square Enix account.