As with most of the game in the series Disgaea 5 is getting dlc form the previous games letting you the player get your hands on your favorite character from the past like they were part of the game to begin with. The DLC is from Disgaea 4 with each character having their own story. The chapters will be in two with Valvatorez chapter and Fuka chapter. Valvatorez will include Fenrich, and Artnia. Fuka, Desco while Emizel will come with Fuka chapter. Also we have an interesting character in Nisa. NISA from the Neptunia series will bring Justice to the Netherworld yet again. Her abilities go up 1% for every 10 hours of Disgaea 5 you’ve played. She will be sold separately for 300 yen. So if you want more disgaea characters you got them.
Article: http://www.siliconera.com/2015/04/30/disgaea-4s-heroes-nisa-coming-disgaea-5-dlc/
As always thank you for reading.