Possibly it can be used to write Finnish an Estonian, but how to write Finnish letter ä (and å, only in foreign names and loanwords) and Estonian letter õ?
Natives:Suomi (Finnish), 中文 (Chinese)
Learning:English, Français (French)
Can read:Magyar (Hungarian), Deutsch (German), العربية (Arabic) and many other languages
Conlangs:Germanoška jázik, Südürafı tılı, Strachte