Formal:
* Αγαπώ τον πατέρα μου. (Agapo ton patéra mou.) - This is the most literal and formal translation.
* Σ' αγαπώ, πατέρα. (S' agapo, patéra.) - This is slightly less formal and adds a touch of endearment.
Informal:
* Σ' αγαπώ, μπαμπά. (S' agapo, mpaμπá.) - This is the most common way to say "I love you, Papa" in informal settings.
* Μπαμπά, σε λατρεύω. (Mpaμπá, se latrévo.) - This is a more intense and affectionate way to say "I love you, Papa."
Note:
* Πατέρας (patéras) means "father."
* Μπαμπάς (mpaμπás) means "Papa" or "Daddy."
Ultimately, the best way to say "I love Papa" in Greek is the one that feels most natural and appropriate for your relationship with your father.