You Do Need power plug adapter while traveling from Brunei to Canary Islands.

Here is Why You Need An Adapter

The outlet and plug type used in Canary Islands are C, E and F and in Brunei is G. This is how they look like.

Brunei

In Brunei, outlets of type G are in use.

Type G

Canary Islands

In Canary Islands, outlets of type C, E and F are in use.

Type C

Type E

Type F