Formal:
* Moi seul(e) - This is the most literal translation and is suitable for formal situations.
* Seulement moi - This is another formal option, emphasizing the "only" aspect.
Informal:
* Moi tout seul(e) - This is a more informal version that emphasizes being alone.
* Juste moi - This is a casual option, similar to "just me."
Examples:
* "Only me knows the secret." - Moi seul(e) connais le secret.
* "It's only me who wants to go." - Seulement moi veux y aller.
* "I'm here all alone." - Je suis ici tout seul(e).
* "It's just me here." - C'est juste moi ici.
The best option for you will depend on the specific situation and the level of formality you desire.