I'll admit it, I effing LOVE Ukoku and his alter ego Nii Jenyi. I mean, look at my default icon. Sociopathic evil geniuses are like the best thing ever. But I think I fell in love hard after watching his story in the Saiyuki Burial anime series that gives you a small taste of where he came from and his general mindset about life.

If you do find the Gaiden OAV, can you let me know where? I only remember the Gaiden segments in one of the other series runs.