You Do Need power plug adapter while traveling from Kiribati to Abu Dhabi.

Here is Why You Need An Adapter

The outlet and plug type used in Abu Dhabi is G and in Kiribati is I. This is how they look like.

Kiribati

In Kiribati, outlets of type I are in use.

Type I

Abu Dhabi

In Abu Dhabi, outlets of type G are in use.

Type G