I've seen some unusual characters in names, but I want to be sure about what is or isn't enabled.

|
\
/
?
<
>
!
@
#
$
%
&

Are all of the above ok? I know some are used for programming languages and stuff, so they might not work.

I do not know of any characters that can't be used.

Cool. Hopefully one of these will work, too, then: ᴻ И ᴎ И и

Do any of those show up as a weird box for anyone, or are they all clearly a reverse "N"?