Blue: Is my name legal?

I'm tired of hearing "your name is not legal" (TOS) from some peeps, so here goes:

Blue, is my name legal? I believe so because it is simply two letters, one with a grave and one with an accent. Moreover, are all names with accented characters considered legal here in the US? I know in English, those characters are not used.

Everyone else: How would you pronounce my name in Vent? Ive heard everything from "Oh Oh" to "Ooooh", lol.

Thanks

(edit: typos)