Is it only me or you can't create chars with the char ` in it?
Back in 3.2.0 I deleted my `x` char. 5 minutes after the reset when I tried to create it it was said that it was taken.
Now, after trying out chars with the char ` in it, I couldn't create any of them.
Is it supposed to be liek this?

probably... maybe ` looks too much like '. They implemented a bunch of restrictions on new char names in that time frame. Since it's the default for console they don't want people using it in there names because it's difficult for most players to type.

It's impossible for most players to type, unless they change their bindings through the wgaf file, which I am sure most people don't find fun.

no you can change it in the options menu, and you can also tab compelete any name containing it.

The use of ` was restricted awhile back because it complicated trying to use commands with players who had that symbol at the beginning of thir name.

It also restricts people trying to use "[NPC]," "[NPCDEF]," and "<," which means, no more "<<<Gold Killer>>>" *shouts for joy*

I think the message should be changed to something like "The name you tried to register is restricted".