One Piece's Elbaf Arc has introduced quite a few new characters, but Prince Loki is already the best among them.

That could explain a lot of Loki's role in the story and could also allow people to see a different side of Imu, who is a character who is filled with mystery. Imu's eye as seen in the anime ...

Both these versions of Nika seem to be currently personified by Loki and Luffy respectively, with Luffy representing freedom and liberation while Loki represents chaos and destructiveness.