sadly i don't think they're gonna have a season 2. Read the wikipedia and it will say why. Its a shame because i love'd season 1. But the chance of season 2 coming out is 1% sorry :(
Yes, there is one based on the game. it's called Makai Senki Disgaea.
The game "Disgaea: Afternoon of Darkness" played on PSP has been adapted into a manga called Disgaea or in romanji Makai Senki Disgaea. There is also a Disgaea 2. So, yes, it is a manga.
The cast of Makai senki disgaea - 2006 includes: Sandy Fox as Flonne Grant George as King Krichevskoy Barbara Goodson as Laharl Tomoe Hanba as Etna Taketoshi Kawano as Bannin Kaori Mizuhashi as Laharl Yurika Ochiai as Thursday Michelle Ruff as Etna Chiwa Saito as Jennifer Nobuo Tobita as Gordon
Makai senki Deisugaia - 2003 VG is rated/received certificates of: USA:T
Makai senki Deisugaia 2 - 2006 VG is rated/received certificates of: Australia:M USA:T
The cast of Makai senki Deisugaia - 2003 includes: Sandy Fox as Flonne Barbara Goodson as Laharl Tomoe Hanba as Etna Kim Mai Guest as Etna Hironori Miyata as Archangel Vulcanus Kaori Mizuhashi as Laharl Tomomichi Nishimura as General Carter Yurika Ochiai as Thursday Chiwa Saito as Jennifer Paula Tiso as Jennifer Nobuo Tobita as Captain Gordon Kosuke Toriumi as Kurtis
The cast of Makai senki Deisugaia 2 - 2006 includes: Tomoe Hanba as Etna Eriko Hara as Mom Nobuyuki Hiyama as Axel Lara Jill Miller as Yukimaru Hikaru Midorikawa as Adell Takashi Nagasako as Director Michelle Ruff as Etna Stephanie Sheh as Hanako Hiro Shimono as Taro Shiloh Strong as Adell Chihiro Suzuki as Tink Yukari Tamura as Rozalin Kana Ueda as Yukimaru Norio Wakamoto as Overlord Zenon
Haibane Renmei , Battle Angel Alita , Angel Sanctuary OVA , Angel's Feather OVA , Angel Tales , Angel Tales 2 , Aquarion , Ayashi no Ceres , Ceres : Celestial Legend , Disgaea , Happy World! OVA , Kamisama Kazoku , Koutetsu Tenshi Kurumi Zero OVA , Makai Senki Disgaea , Pita Ten , Saint Beast , Saint Beast : Ikusen no Hiru to Yoru Hen OVA , Saint Beast: Kouin Jojishi Tenshitan , Sousei no Aquarion , Sousei no Aquarion OVA , Steel Angel Kurumi Zero OVA , Tenshi Kinryoku OVA , Tenshi no Shippo and Tenshi no Shippo Chu!
Danball Senki was created in 2011.
Bahamut Senki happened in 1991.
Napoleon Senki happened in 1988.
Jyutei Senki happened in 1993.