You Do Need power plug adapter while traveling from Saint Kitts and Nevis to Tunisia.

Here is Why You Need An Adapter

The outlet and plug type used in Tunisia are C and E and in Saint Kitts and Nevis are D and G. This is how they look like.

Saint Kitts and Nevis

In Saint Kitts and Nevis, outlets of type D and G are in use.

Type D

Type G

Tunisia

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

Type C

Type E