The Darth Knight!
Boba fett seems to be a popular mashup subject, with people reskinning Mando armor for different characters. I think that's why I liked the Spartafett helmet so much - someone thought to put a Boba Fett finish on somebody else's helmet for a change.
I've also seen a borg Slave Leia, a dancing banana Spider Man (red, yellow and blue,) and various stormtrooper variants (like this year's D*C Planet of the Apes trooper).