Mega Man Zero

Kazuya Nakai

Yuto Kazama

Rie Tanaka

Megumi Ogata

Tetsu Inada

Yuka Imai

What are the differences between the International and Japanese Version?

Altogether, there are four different parts that are all being censored for the US/European market. The Japanese version is the only one that has not been censored. Perhaps the publishers were concerned that one may think the red oil might be blood. A detailed comparison can be found here.