You Do Need power plug adapter while traveling from Fiji to Côte d'Ivoire (Ivory Coast).

Here is Why You Need An Adapter

The outlet and plug type used in Côte d'Ivoire (Ivory Coast) are C and E and in Fiji is I. This is how they look like.

Fiji

In Fiji, outlets of type I are in use.

Type I

Côte d'Ivoire (Ivory Coast)

In Côte d'Ivoire (Ivory Coast), outlets of type C and E are in use.

Type C

Type E