Where does this style work?

It works wherever plain text is accepted — bios, usernames and comments — because the letters are real Unicode characters, not a font.

Can I copy it together with other words?

Yes — copy the whole output and paste it next to plain text; every letter stands alone.

Letters inside circles — cute and playful

Bubble puts every letter inside a circle (Ⓐ ⓑ ①). The playful choice for cute bios, games and kid-friendly usernames.

Ⓨⓞⓤⓡ ⓣⓔⓧⓣ ⓗⓔⓡⓔ