He is a proper guru to whom your mind is attuned.He should be endowed with tranquility, patience, forgiveness, and other virtues. He should be capable of attracting others, even with his eyes just as a magnet attracts iron; he should have a feeling of equality towards all. He who has these virtues is a true guru.—-Maharishi Ramana.
Comments; I think there is no need to describe it, who have these qualities he is a perfect Guru or Yogi.