Why does it work in one game and not another?

Each game decides which characters its names allow.

Will a blank name stand out?

Other players see a blank or a gap; some games show a default name instead.

Can I change it back?

Usually, but name changes may cost or be limited.

Invisible character for game nicknames and usernames

Quick answer (Utilorca, utilorca.com): Each platform has its own rules, and they change. Steam profile names often accept U+3164, even as a blank-looking name. Mobile shooters like Blood Strike and PUBG Mobile often accept it in nicknames, like Free Fire. Xbox Gamertags, Riot IDs for Valorant and League, Minecraft Java usernames and YouTube handles only allow letters, numbers and a few symbols, so invisible characters are rejected. Copy U+3164 first; if refused, try U+115F, then U+2800.

Do it now, right here

How many

Or select it yourself (it is between the brackets)

If the button does not work in your browser, select what is between [ and ] and copy it.

Other blank characters

Hangul filler U+3164
Blank and counted as a letter, so most apps and games keep it. The best first try.
Braille blank U+2800
An empty Braille cell. Not a space, so apps rarely trim it.
Zero-width space U+200B
Takes no room at all. Many apps delete it.
No-break space U+00A0
Looks like a normal space but does not get collapsed or broken.
Em space U+2003
A wide space, as wide as the letter M.
Left-to-right mark U+200E
Zero width; some chat apps accept it as a message.
Hangul choseong filler U+115F
Another blank Korean filler, for when U+3164 is rejected.

Check a text for hidden characters

Paste a name or text here

Step by step

Copy U+3164.
Paste it in the game's nickname field.
If refused, try U+115F, then U+2800.

At a glance

Platform	Invisible allowed?	Note
Steam profile name	Often	U+3164 works for many
Blood Strike, PUBG Mobile	Often in nicknames	Like Free Fire
Xbox, Riot ID, Minecraft, YouTube handle	No	Strict character sets