Mr. Jap

Mr. Jap is said to be the RUC's very first enemy. It is said that Popeye either formed the klan before or after defeating and locking up "Mr. Jap," no one knows since the lore on their own wiki is inconsistent.

RUC's Story
According to their wiki, Mr. Jap was a Japanese man who was the commander of the army for some queen of Korea or something. (Typical of them to lump all Asians into a single group). He is an evil person, just like everyone else the RUC has faced, mainly because he's Asian, the RUC hates Asians after all. Popeye either formed the Radioactive Uber Klan to defeat him or he formed it afterwards, very inconsistent lore on their wiki and all.

Truth
Mr. Jap was a name applied by Popeye to a random Chinese man who was assaulted by him on his way to work. People only know that Popeye thought "Mr. Jap" killed his parents and attacked his hometown and evil evil blah blah Satan blah.

Bloody Sunday
The event known as "Bloody Sunday" was the day that "Mr. Jap" was captured and imprisoned. Popeye brought along Jafar (his childhood friend), Count Chocula (a vampire he got addicted to chocolate so he would be easier to control) and Merlin (a wizard he kidnapped and forced into his klan). The first Asian man Popeye saw would be the unfortunate soul who would be labeled "Mr. Jap." He started running from Popeye, and Popeye gave chase. Anyone who was physically standing in the way (even though they can just move) were beaten, dismembered, turned into snakes, blown up, had their blood sucked out, other horrible stuff. Popeye claimed these people were evil "Jappernites" who were "Mr. Jap"'s evil henchmen. They left a trail of destruction and death behind them before they finally caught up to "Mr. Jap" and later imprisoned him in the crappy shack they would steal from a hobo they called the "Blood King."

After the event, many families mourned the loss of their loved ones who were killed in Popeye's irrational rampage to capture "Mr. Jap." Most of them were captured and beaten to death afterwards for speaking against the RUC. "Mr. Jap"'s family went missing after Bloody Sunday; many presume that the RUC has captured them and killed them.