Disgaea 2: Dark Hero Days

Disgaea 2: Dark Hero Days (known in Japan as Disgaea 2 Portable) is a tactical RPG game developed by Nippon Ichi Software and published by Sony Computer Entertainment in Japan on March 26, 2009 and by NIS in North America on September 8, 2009 and Europe on November 3, 2006 for the Sony PSP. The game featured many DLCs, each one granting access to new characters to recruit. With the shut down of the PSP frontend online shop they can no longer be obtained on the original console. The PS Vita release of the PSP version allows to download all of the content, but to be able to get everything on the original hardware a Sony PS3 is needed (see below for details).

How to obtain
The DLCs can still be obtained on the PS Vita release from the Playstation Store or, on the PSP, by purchasing the PSP version on a Playstation 3 system and then transferring them on the handheld console.

A guide on how to transfer content can be found here.