Question: are the disgaea games connected?
Answer: Disgaea 1, 2, 4, and D2 are all connected though, sharing several characters (well really just the Disgaea 1 cast and Axel from Disgaea 2). ... Only Disgaea 1 and Disgaea D2 are connected by story. The rest of the games are mainly just cameo appearances or characters just spilling over (primarily in the post game).