Been a fan of Disgaea since the PS2 days. Disgaea 1 was amazing.
The game is just plain fun. The story doesn't take itself seriously. You'll chuckle a few times. The story, though, is just a minor part of the game. Post game is where all of your 47485648: hours will be spent. If you think I'm exaggerating on the hours, I'm not lol.
Grinding is a big part of the game but for me, it's the most fun and it doesn't feel like a chore.
You can level up characters to 9999. You can even perform a reincarnation and start back at level 1 but you would be much stronger.
You can go into items and level them up and make them stronger. This is the item world...and when I say items, I mean all items. Weapons, armor, items.
Deal damage in the billions!
You can create a number of characters/monsters.
You can absorb a character in order to become stronger.
You can attempt to pass certain bills that have different effects: have more high level equipment for sale, stronger enemies, gain more experience etc.
The above cost Mana, which you get from defeating enemies. In regards to defeating enemies, only the character who delivered the final blow will get the experience (unless you performed a team attack..then those members will get experience).
Speaking of team attacks, if one of your characters attacks an enemies while his teammates are directly next to/behind him, there's a chance of a team attack. So you could have 1-4 people attacking the same enemy. Theres a percentage that you can increase.
Many things to learn in this game and if it's your first game you MAY get overwhelmed but it's nothing that would make you annoyed.
Disgaea 3 is the perfect Vita game right now, IMO. One of the reasons why I bought a Vita.
I've never played Disgaea 3 on the ps3 and I'm glad. Playing on the vita is a dream come true. I believe there are cameos from the other Disgaea games but you don't NEED to play them but it's cool to see a character and say, "oh snap! It's you again!"