Disgaea 2 PC is definitely not the definitive version because the Japanese PSP version is still better than it in some ways. This guide will show you changes that you might miss. Comparing PC and Japanese PSP version in depth. (kinda)

Use the Guide Index (sidebar) to find what you want to see.
Click image to show the original size.

("the best" is a cheap version. In the PS2,PSP days. They usually ship with fixes.)

Just in case, The term D2 in this guide is referring to Disgaea D2. Not Disgaea 2. I will simply refer Disgaea 2.as 2.

• Added End Turn and Execute shortcut keys
• Added event skip confirm like the Disgaea 3, 4 Vita ports
  (Image on the right)
  
• Mouse support
  
• Added an option to change filter (Off, Bilinear, Bicubic)
  
• DLC Characters are not fixed at level 100 (Similar to D2 and 5's behavior which the level is depends on story progress)
  
• Removed promotional videos in Dark Assembly
  
• Some 3D map texture error fix

• No longer able to fast forward text message by holding cancel key
  
• No sound effect when unit being cloned by geo panel
  
• Rifle Demon gets a new (weird) sound effect
  
• No red flashing highlight on a unit when a skill is targeting a humanoid unit
  (Image on the right)

Some background music has changed due to copyright issue, lost of asset or other reasons:

The "new" UI in Disgaea 2 PC has borrowed some of the future Disgaea games element in it. Like the map panels and the font.
However the "old" UI isn't actually the one being used on PSP version. The "old" UI is instead a dumped-down version of PSP UI (Mixed with some PS2 UI). Also using an uglier font to make it looks ugly when comparing to "new"

As mentioned in "Minor changes". Text message can't be fast forwarded by holding cancel button. Also the skip button prompt is missing. The PSP version doesn't have skip confirmation though.

Apparently, Pleinair's HD portrait is using Disgaea 3 version instead of her Disgaea 2 version.








The change might be because they can't find / lost the high resolution assets. Although the DLC icon of PSP version is using the non-pixel art portrait

• キャラ配信：トロ＆クロ (Character: Toro & Kuro)
  
• アイテム配信：トロの拳 (Item: Toro's Fist)
  
• アイテム配信：トロの槍 (Item: Toro's Spear)
  
• アイテム配信：クロの剣 (Item: Kuro's Sward)
  
• アイテム配信：トロの弓 (Item: Toro's Bow)
  
• アイテム配信：クロの銃 (Item: Kuro's Gun)
  
• アイテム配信：トロの斧 (Item: Toro's Axe)
  
• アイテム配信：クロの杖 (Item: Kuro's Staff)

All available for free on Japan PSN for Makai Senki Disgaea 2 Portable.
All DLC weapons are IR40 and have a decent starting stats.






The leftover character icons and weapon descriptions in PC version:
*Not actual weapon stats
**Have no English descriptions



All game trailer senatorial bills (インフィニットループ ～古城が見せた夢～, Prinny 1, 夢想灯籠, 流行り神 1, 2, Disgaea 3) in Dark Assembly are gone as well.



The reason why they are gone is simply because they are promotional contents. Toro & Kuro also known as Sony Cats in the west. Their appearance for the west is only on Street Fighter X Tekken and PlayStation All-Stars Battle Royale (PS3, PS Vita). Their only appearance for non-PS platform is collaboration event in a Japanese online called Phantasy Star Online 2 (PC, PS Vita, PS4, Android, iOS). Items and costumes obtained from the event can be used an all platform. But the Toro & Kuro event is only accessible on PS4 / PS Vita.

With their only PC appearance is a multi platform Japanese online game. Toro & Kuro are most likely won't come to Disgaea 2 PC in the future.
(And future Disgaea PC ports along with Famitsu, Dengeki PlayStation contents)
The Switch version Disgaea 5 has confirmed no Toro&Kuro spell for the obvious reason. Also no replacement for that (Mario&Luigi perhaps?)

Some battle has changed the map for unknown reason.

In order to compare both game in depth. I need time to finish both versions so stay tune for update.

March 12th,13th
Added BGM changes, more details on minor changes and fixed some typo.