I still don't understand Ratei either... was he an entity on its own that could have manifested on someone else or was he born as a combination of Ginj specific sorrow and rage and the limitless power of the fortress? So was he a split personality of Ginji, a dark side of him, or did he posses Ginji.? or else?
And I always thought Ginji was known as the lighting lord while he was the ruler of infinity fortress because the lighting lord manifestations were what allowed him to become the ruler, but it didn't mean he was on lighting lord mode all the time, only when he had to fight, but I don't really know anymore.
Oh... and perhaps is a silly question but I gotta ask... Ginji's electric powers... do they come from ratei or those are his own?