You Do Need power plug adapter while traveling from Saint Lucia to Burkina Faso.

Here is Why You Need An Adapter

The outlet and plug type used in Burkina Faso are C and E and in Saint Lucia is G. This is how they look like.

Saint Lucia

In Saint Lucia, outlets of type G are in use.

Type G

Burkina Faso

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

Type C

Type E