Here are some other options, depending on the context and level of intimacy:
* "Ente kaaval" (എന്റെ കാവൽ): This translates to "my guardian," but it is also used to mean "my sweetheart" in a more romantic and protective context.
* "Ente jaan" (എന്റെ ജാൻ): This translates to "my life" and is a very intimate and loving term.
* "Ente priya" (എന്റെ പ്രിയ): This translates to "my love" and is a more general term of endearment.
Ultimately, the best way to say "my sweetheart" in Malayalam will depend on the specific relationship and context.