The only feeling a dead soul will have is remorse. Remorse for the people it left behind. Regrets for the things it did and didn't do.
The soul with the most regrets is Genghis Khan (かん). Everyone knows to stay away from him in the spirit world because he's so sad. Not because of his own actions, but because of the state of his people now.
Currently there are no similar looking kanji which exist in the WaniKani learning system