Will I be able to use this beta character on release?

I would think nope, not gonna happen.... Even if anything may be possible.

I don't think any game has ever allowed that, the point of the beta is for testing. not an exclusive chance to surpass other players

No. All MMO's completely wipe the server before the official launch.

lol no.

As stated before, Beta testing is to play for a long amount of time and look for any bugs or poor design choices that users comment on, and later get changed for the final release. Beta are not to be confused with Demos, which are a segment of the final product, usually enough for you to get an idea of whether or not to play the full game.

None of you have played the latest FF MMO? Open Beta characters were transferred to release.

No