Summary of the Verse
The Nippon Ichi verse is the collective mass of every game that was developed by Nippon Ichi Software, the reason every game takes place in the same verse is that of how several characters appear in different games (Laharl appearing in Makai Kingdom, Darkdeath Evilman appearing in Disgaea D2 etc). The first game developed by Nippon Ichi Software that became a part of the verse was Rhapsody: A Musical Adventure followed up by its two sequels before making games like Phantom Brave, La Pucelle Tactics, the Disgaea series, Makai Kingdom, Soul Nomad and the World Eaters, Z.H.P. Unlosing Ranger Vs Darkdeath Evilman and The Witch and the Hundred Knight 1 & 2. Every game follows a different protagonist in a different part of the verse, like the human world or a different Netherworld. Most of the games developed by Nippon Ichi Software are Strategy JRPGs similar to Fire Emblem or Final Fantasy Tactics, with exceptions like Z.H.P. Unlosing Ranger Vs Darkdeath Evilman which was a Roguelike game, both The Witch and the Hundred Knight 1 & 2 which are action RPGs and Labyrinth of Refrain which is a first-person dungeon crawler.
Power of the Verse
The Nippon Ichi Verse has many powerful fighters in the verse. Low Tier characters (Prinnies and weak humans) are Planet Level, some are Star Level because of their ability to destroy a star, though there are characters from different parts of the Verse that is even weaker than that such as Phantom Brave, The Witch and the Hundred Knight 1 & 2 and Labyrinth of Refrain which is filled with characters that ranged from City Block Level to Country Level.
Mid Tiers are Multi-Solar System Level due to their being fodder demons have been stated to be able to destroy large amounts of stars.
High Tiers are Galaxy Level due to their being characters who can destroy Galaxies but aren't considered strong enough to be a serious threat.
Top Tiers are Universe Level+ who can scale to overlords or beings who can create or reset a universe like Metallia or Chelka.
God Tiers are the characters that are Low Complex Multiverse Level which are demons from the Carnage Dimension which are stated to have higher-dimensional power when compared to the the normal dimension which can contain a Fifth Dimensional being and Complex Multiverse Level which include most of the protagonists who should scale to Zetta who is able to create the Overlord's Room which is able to exist outside of the Cosmos, which includes the Carnage Dimension which can hold beings which have Sixth-Dimensional power.
In terms of speed feats, the God Tier, Top Tier, High Tier and Mid Tier characters fall into the MFTL+ since they are comparable to characters who can react to and dodge Darkdeath Evilman's Gigantus Ray which travels the radius of the Milky Way Galaxy in one-thirteenth of a second which puts them at being several trillions of times faster than the Speed of Light. However, some of the Low Tier are FTL and the characters who are even weaker are typically around Massively Hypersonic speed.
In terms of Haxs, there are several characters Toon Force users, Poison Manipulators, Time Manipulators, Soul Manipulators, Pocket Dimension Manipulators and several other ways to bypass durability like transforming people into flowers, attacking someone's soul or Reality Warping.
La Pucelle: Tactics
Disgaea 1: Hour of Darkness
Makai Kingdom: Chronicles of the Sacred Tome
Disgaea 2: Cursed Memories
Soul Nomad & the World Eaters
Disgaea 3: Absence of Justice
Prinny 1 & 2
Z.H.P. Unlosing Ranger VS Darkdeath Evilman
Disgaea 4: A Promise Unforgotten
The Guided Fate Paradox
Disgaea D2: A Brighter Darkness
The Witch and the Hundred Knight
Disgaea 5: Alliance of Vengeance
Labyrinth of Refrain: Coven of Dusk
The Witch and the Hundred Knight 2
Human Character Classes
Male Martial Artist
Female Martial Artist
Monster Character Classes
Weapons and Items