What is an antonym for interloper?

Here are some antonyms for interloper, depending on the specific context:

General Antonyms:

* Welcome guest

* Invited person

* Legitimate participant

* Authorized individual

* Member

* Insider

More Specific Antonyms:

* Host (if the interloper is intruding on someone's property)

* Owner (if the interloper is interfering with something belonging to someone else)

* Beneficiary (if the interloper is gaining something unfairly)

The best antonym will depend on the specific situation and the meaning of "interloper" in that context.