Fat Friar
Reasoning: This card represents a sensitive, forgiving, and spiritual individual. This person is patient and kind, intuitive and emotional.
The Fat Friar, ghost of Hufflepuff, is an obvious symbol of spirituality, having lived a life of religious devotion. He is kind and apparently infinitely forgiving, as he is willing to give Peeves a second (possibly more..) chance.
In a traditional tarot deck, this is the Queen of Cups.
Notes
Good ol' Fat Friar. I have a very specific mental image of him, so he's pretty easy to get down on paper. That tapestry was lots of fun, particularly the parts you see through the friar (which is achieved using slightly lighter colors of yellow/black and pencil. No computer transparencies are involved with the ghosts).