You Do Need power plug adapter while traveling from São Tomé and Príncipe to Tahiti.

Here is Why You Need An Adapter

The outlet and plug type used in Tahiti are C and E and in São Tomé and Príncipe are C and F. This is how they look like.

São Tomé and Príncipe

In São Tomé and Príncipe, outlets of type C and F are in use.

Type C

Type F

Tahiti

In Tahiti, outlets of type C and E are in use.

Type C

Type E