Vash The Stampede (or Vash) is one tough man. But there is more to him than meets the eye. Those of you who have seen the series and know the plot well he is one who hides his feelings pretty well and keeps things to himself, and shows no emotion.
There are people in life that have similar personalities. And believe it or not it's not good to hold your emotions inside, because they will eventually come out in a violent, not-so-healthy way. And the frusterating part of it all is knowing someone with that type of personality and not being able to help them because they won't let you in.