You Do Need power plug adapter while traveling from Malawi to Aruba.

Here is Why You Need An Adapter

The outlet and plug type used in Aruba are A, B and F and in Malawi is G. This is how they look like.

Malawi

In Malawi, outlets of type G are in use.

Type G

Aruba

In Aruba, outlets of type A, B and F are in use.

Type A

Type B

Type F