When my nephew asked me who trained Yoda, I felt ashamed that I had to look it up.
Even though he is responsible for Yoda becoming a Jedi, Master N’Kata Del Gormo has no presence in the comics or the fan community. This is my take on him based on the one picture in Wookiepedia.
C’mon, the new movies will be out soon. We need to get our act together people.