Early quick & easy leveling tip if you didn't know

[DovahZeux]

If you buy several Unopened Sodas (I'm assuming Mint Gum works too), and give them to a character, you can easily powerlevel the character who gave the item, as it gives a specific percentage of EXP towards your level each time, and the item becomes an Opened Soda afterwards for further giving. This means you could be level 10, give a certain number of sodas out, and still the giver owns the same EXP percentage they would have at a lower/higher level, for quick leveling. Works great with the 1 million HL special content bonus you can get early on.

Happy grinding! \o/

[Shion SinX]

It gives 1/8 of the exp needed to level (base, not proportional to what you have alredy). It scales up with any exp boost, like the 'triple exp' bill, geo effects (like +50% exp from world 2-1) or evilities (specially Valvatorez's Prinny Instructor which stacks with itself and can be abused on the Prinny Squad).

On my first playthough on the old demo I power leveled my Killia to lv500 mostly with this trick, and turns out its nothing for the early post game even (Disgaea games are known for having fairly easy main story wise, like finishing at lv100ish is normal).