You Do Need power plug adapter while traveling from Niue to Myanmar (Burma).

Here is Why You Need An Adapter

The outlet and plug type used in Myanmar (Burma) are A, C, D, G and I and in Niue is I. This is how they look like.

Niue

In Niue, outlets of type I are in use.

Type I

Myanmar (Burma)

In Myanmar (Burma), outlets of type A, C, D, G and I are in use.

Type A

Type C

Type D

Type G

Type I