Prinny: Can I Really Be The Hero? Easter eggs

Star Wars Darth Vader reference
During the boss battle against Darth Moab, he will make comments before hand that are very similar to that of Darth Vader ins Star Wars.

"I halve you now"
"Do underestimate the farce"

as well as some others.
Aside from this, he also has a similar design in his character to represent Darth Vader's cape and voice.