Formal:
* Bonjour, mon chéri/ma chérie: This is the most literal translation and suitable for a romantic partner.
* Bonjour, mon/ma cher/chère: This is a more formal way to address someone you know well, like a friend or family member.
Informal:
* Salut, mon cœur/ma chérie: This is more casual and can be used with someone you're close to, like a partner or friend.
* Coucou, mon/ma chéri(e): This is a very informal greeting, best used with someone you know very well.
* Salut, mon/ma chouchou: This is a more playful way to say "hello sweetie" and is often used with someone you're close to, like a child or a significant other.
Remember to choose the appropriate greeting based on your relationship with the person and the context.