Have you ever wondered what would different g2 masks look like on kopaka? Well if so here you go
As you can see the 2015 mask of ice doesn't work due to the top binocular piece
G1 jungle does work however as do most of the others (I don't have the earth mask)
How about a protector mask?
Again doesn't work but what about a skull spider?
That works alright with the creature head
Which do you think looks the best?