Limit Break
Meteor, Ready?
I was hoping Kougami was the original OOOs back in the day to be honest, shame that wasn't the case. 
Yeah, the only German related to OOO was a bit of the TaJaDol song.
When you think about it, shouldn't the OOO Driver speak German instead of Japanese?
Get out. Now.
But seriously, if you are talking about Nazi's, I think that's where Shocker comes in. Or maybe it was one of the other Showa villains. I think someone once made a reference to one of the evil organizations from the Showa era being like a reference to the Nazis or the time Japan was under Nazi rule.
Wait, why would that be a bad thing?if that were the case there would be no henshin songs, it would all just sound like the belt was screaming at you to put on your boots and get ready to march to Poland. Mostly because everything in German makes you sound absolutely furious.
ANY CAMP GOES
NAZI RIDER OOO!
GERMANY!JAPAN!ITALY!
GERJATA GERJATA GERJATA!
CONQUERING CHARGE!
Yeah, I could see that being some kind of evil rider...