I always thought that she (Trigon, Sons of Trigon, and the Church of Blood) would be a great acquisition,for Justice League Dark. It would benefit her to be more involved in the mystical side of the universe by meeting characters such as Constantine, Zatanna, Etrigan, etc. Another character that worked was Wonder Woman, who has joined JLD in recent years and it did well for her I liked that she felt out of place with them because she is not used to the dark and horror side of the magic and she has always been in her corner by fighting Gods and has to rely on power, martial skill and divine weapons but when she was in a team with someone like Zatanna she needs more than that and she does not know what she is doing because her world is different from them and it requires cost and sacrifices. Unlike WW, I don't think Raven will feel out of place she would feel quite at home with all the dark and horror elements of magic.