Capturing monsters. By throwing a monster-type enemy (not a human-type, unfortunately), it will join your party under certain circumstances. Seeing as throwing an enemy on one another fuses them together, adding their levels together, it takes only 8 hours to go from a level 500 character to five level 9999 characters.
No longer possible in the games following Disgaea 2 (The remake of 2 included), as you can't capture monsters of a higher level than the main character.
Even as late as D4 you can utterly break monster captures, with the help of the Land of Carnage. The level cap for the games is 9999, but LOC enemies continue to gain stat boosts even beyond that. Their official level may be 9999, but they are actually much more powerful, and if your own characters are 9999 (pretty much a certainty if you are in the LOC) then you can capture them. You just need to be clever to do it. There is an innocent that can render you immune to physical attacks on odd turns, and magical attacks on even turns. So simply determine which type an enemy will use, make sure one of your characters has that innocent, and attempt a capture on the proper turn. You are guaranteed to win.
The capture mechanics differ again in D5. While you can use a variety of skills to imprison an enemy and later conscript them, you have to unlock their class to do so, and you have to be their level or higher. The same cannot be said out of using them for enhancing your Squads or making Extracts, however.
It's possible to apply both the poison and sleep status ailments to any non-boss enemy to kill them off with ease, regardless of the level difference between you and them. As a result of this, one can clear some optional maps with extremely good rewards (Dark Sun level 1-4 of Axel Mode in Dark Hero Days in particular) far earlier than intended, and break the game with the absurdly powerful equipment and tremendous EXP rewards from them.
Magic Knights tend to be in the running for the best class in multiple games, minus the very first game. In essence, take Flonne from the first game, give her more survivability and an innate ability that increases the damage of elemental spells and you have the Magic Knight class. If you want to push it further, have them have an innate resistance to their element since their second ability, Elemental Force, lets them further increase the damage of the element spell they're strong against. Their unlock conditions are usually really simple too, usually requiring you to level up a Warrior/Valkyrie and Skull/Mage up to level 25. Once you unlock them, make three that specialize in each element, teach them the star and heal spells and watch them proceed to tear the game a new one.
On that note, magic attacks, in general, tend to be miles ahead of other options when it comes to the sheer raw damage they can deal out at a surprisingly far range. Gun and bow skills often pale in comparison to the range spells can obtain after even a slight amount of work put into them, with far higher damage output than both the previous classes combined, on top of spells getting variable AoE modifiers to their spells to hit several enemies at once; often way more than most other AoE attacks can hit. The things that are supposed to balance them out, elemental resistances, immunities, and paper thin defense are easy to work around or ultimately don't matter; just have your caster use the element the enemy is weak to to deal with them or give them the star line of spells to nuke them for Non-Elemental damage and, after you reach a certain point in most Disgaea games, defense onanyunit doesn't matter anymore. Often, the most 'efficient' party in most games consist of a group of mages specializing in each element, a few fodder units to draw aggro off them and maybe a storyline character or two. This is somewhat nerfed in 5 due to alterations in defensive calculations and the negation of damage accumulation per skill level (raising skill levels only lowers the SP used per cast).
Violence, an evility that first appeared in Disgaea 3 and would continue to appear afterwards, boosts a unit's stats by 50% while decreasing their EXP gain by 50%. At level 9999, it's just a free, massive stat boost that puts any other to shame. 5 nerfed it severely by causing it to take up 6 evility slots (out of 10 per row, which makes it restrictive to equip), making it less efficient (but still nice to have).
The More Expensive Stuff proposal at the Dark Senate, if one is lucky (or just save scums), can open access to the best equipment in the game very easily, combined with the extortion option and other easy money schemes can cause your level one character no rebirths to be on tier with level 50 characters with ease, at a point in the game where enemies are only level 20.
Flonne starts off weak but if you give her pupils to learn all the elemental magic skills and give her a staff she can nuke anyone from across the map. And considering that a Galaxy Mage/Skull knows pretty much every spell bar defensive buffs, you can have all her other pupils beef up her other stats.
The Samurai class. Unlocking it requires only a Lv 10 Female Brawler and Valkyrie (Female Warrior) and as soon as you unlock her, 110% ATK aptitude and S Rank in swords, axes, and spears! There are other classes early on that have 110% aptitudes, but having a great close ranger fighter is a must and the only other class that has those ATK aptitudes is the Majin class. Add in the fact that she has an S rank with swords right out of the gate and the general versatility that sword skills have, and you have a class that can last all the way until unlocking the Majin class.
The Yoshitsuna sword makes all the other weapon types useless in the first game. It has more range than a gun, higher Attack power and capability than any other item PLUS stats boosts in all areas and, coupled with the sheer variety of skills that swords provide, it can cover almost all the area effects you need. It was considerably nerfed down in the sequel.
In the PC port of the game, instead of having to go through specific unlock conditions, you end up getting Pleinair from the start. With great stats and being tailor-made for guns, which in this game can be considered Game Breakers in themselves, Pleinair can easily carry the entire team for most of the game.
In the original PS2 version it was possible to capture a level 9999 monster once you reach the fourth chapter by exploiting Enemy Level Up Geo Panels. This was sadly removed in the PSP version. Said high-level monsters could be used in a variety of ways -clearing Dark Sun stages with ease, allowing your weaker units to reap the rewards of massive EXP and equipment, unlocking high-tier bonus levels leading to even more rewards (Cave of Ordeals, The EDF missions), bulldozing through the item world, stealing, and if you wanted to, you could reincarnate them into a humanoid unit, and have a massive amount of stored levels and bonus points for allocating stats right out of the box.
The PSP remake of Disgaea 2 has seven bonus characters available as downloadable content, two of which are free downloads. Both of these characters join your party at level 100, one of the two (Pleinair) joins your party without a fight (and the other can be beaten once you have Pleinair), and both are available at any point in the game, including the very beginning. How gamebreaking is this? The final boss of the main storyline is only level 90.
This only gets more game breaking if you download other DLC characters as well, as every one of them is at level 100 and uses no equipment until you recruit them. Why is this game breaking? Because now that you have two DLC characters, you can use them to gang up on new character, who's only real threat to you is through their spells. If you rinse and repeat this with every character, then you can have 6 level 100 characters, one of which is purposefully devastating (Demon Lord/Majin Hanako). Consider your first cycle with these characters broken in half.
With a little reloading on facing down these DLC characters on a first cycle, you can also generate a Disc-One Nuke through the bonus gauge, as it's set to rank 20. This can get you equipment you can't yet afford, some extra money, or a small boatload of EXP. Done right, you can easily have your Level one characters bordering 30 by the time all the DLC characters are recruited.
The Ninja can be unlocked fairly early (Have 5 ranks in Sword and Fist Mastery, which Adell and your starting Male Fighter unit can get easily). Normally, you would never bother to use the Weight accessory (which reduces a unit to 1/4 HP) but on a Ninja, it's near-godly. When in critical health, the Ninja's special ability activates - his SPD (evasion) stat spikes to incredible levels. Give him a Weight, Shoes, and a Fist weapon and he'll be virtually impossible to hit, even with healing spells.
Clever manipulation of the Dark Assembly can net you some very valuable items and perks with almost no cost to yourself. There are six parties, three of which are very easy to bribe (Orcs, Wood Golems, and Mothmen) with any outdated/junk items you aren't using (Rank, rarity, and value doesn't really affect how much senators like them) to the point they will adore you. Once Adell becomes a Senator, he can take bribes (often items that aren't available at the shop until you reach higher ranks) and quit the proposal without losing Mana, and increase the influence of the parties that like him.
Hospital exploitation returns from the first game, and with a few hours of work, you can have a massive amount of money and powerful accessories at your disposal. You can do this in the very first chapter of the game, as your healing costs in the first chapter will be the cheapest.
Game-Breaker: Adell is an extremely broken DLC character. Evility that does 30% more damage when attacking one on one plus an S-ranked innate technique which uses an element that many story mode bosses are weak against equals major pain. He can even get an 10% status boost in every stat and an extra 20% boost in his critical stats from sitting next to Rozalin in the classroom. Interestingly enough, these two are in the same download pack.
Also introduced in this game were Fun weapons, each with a fixed innocent that had varying effects (such as restoring 50% HP/turn, gaining +5 counter attacks, even increasing ally monster stats). However, the one best known is the Puppy Paw Stick, an Axe-class weapon with the Cat Burglar innocent. Said innocent had a 20% chance to steal an item off any unit it killed. When combined with Clone panels or Dropouts from the Class World, it basically meant the ability to clone powerful pieces of equipment. NIS however nerfed this twofold in a patch: Clone panels can't affect player-controlled units, and the chance for the weapon to steal an item was dropped to 10%. This weapon also showed up in Disgaea 4, and is still as gamebreaking, though the RNG needs some manipulating to make it more effective.
The Puppy Paw Stick is in D2, though it has finally been nerfed to prevent item duping - it explicitly does not work on senators, and with no Class/Chara world, that's the only time you'll ever fight your own units.
To a lesser extent, Toy Hammer. Its innocent halves the HP of the target if you hit it with a normal attack from behind. When combined with the Dark History, which has an innocent that deathblows units under 25% HP, and a little luck, you can easily kill off enemies far stronger than your characters.
The Cheerleader class in Disgaea 3 has one skill that makes the game a joke. "Let's Go, Cha Cha Cha" What does this do? It allows a unit that has acted once to go again. Yes, that's right, take another turn within your turn.
And now the Vita version of Disgaea 3 introduces Stella Grossular, who's even worse than Adell. Her first Evility allows her to reduce the stats of anyone she's next to on the map by 25%, and if that wasn't enough, her stats INCREASE by 25% for each character next to her on the map. Her second evility that she can learn reduces resistance to fire attacks for all characters on the map by 30%. To top it off, her final skill is a 3x3 attack that is, wait for it, fire based. This makes power leveling her so easy it should be illegal.
If that wasn't enough, the Vita version also has Rutile, a half breed catgirl in the game. Stat wise, she's pretty good, but what makes her really good is that she's the best healer in the game, bar none, due to access to Tera Heal naturally.
Also added are Fuka and Desco, Desco has two evilities that are incredibly stupid. The first one makes it so that she can't be affected by non-special attacks. Put her in an area where everything is affected by forget or silence and she can't be killed by anything. Her final evility, at the end of the turn, paralyzes any enemy within 3 squares of her.
Factory Desco, similar to Mass Produced Kurtis in the first Disgaea game, has two evilities that make the post game an utter joke. Her first evility allows her to recover 10% HP and SP per enemy unit she defeats in battle. Considering that all of her skills are attacks that can hit at, bare minimum, four enemies at a time, she can go from nearly dead to back to full health in an instant. Her final skill, learned only at tier 6 and level 800, allows her to magichange with anyone. In Disgaea 3, you need to put a monster in the same "club" as a human to magichange with them. This evility bypasses that completely and allows for some really awesome tricks to happen in battle.
Anyone who preordered the Premium Edition from Gamestop or NISA store gets access to Fallen Angel Flonne, who is an amazing archer and healer. And unlike the other DLC characters, you get her right at the beginning of the game!
...but not in the Complete editions. You don't unlock her until the post game (unless you enter a Cheat Code at the title screen).
Desco due to her powerful evilities (Increases her attack by 20% for every adjacent ally, gains 20% stats per third of total HP missing, and deals 50% more damage at the expense of 30% of normal mana gain), high stats, and multitude of long ranged area attacks that become even better after a monster fuses with her (Yog Sothoth hits a 3X5 area up to six spaces away, making it the biggest ranged area attack in the entire series). On top of that, she can be boosted even further by a Beast Trainer.
The Heart Cannon Evil Symbol, which allows anyone within its area of effect to be able to launch an extra attack on any target within its attack range if another character launches an attack on said target. If you plan your attacks right, this can lead to some ridiculous combos. And unlike counters, attacks activated through the Heart Cannon can trigger Team Attacks.
Chara World Duping got Nerfed, but has since been replaced with Shop Duping. It goes like this: Fill up the item bag and warehouse with junk items, level an item filled with subdued Innocents to ten, leave. The leveled item will be in the shop; trying it on will allow you to buy unlimited copies of said item.
Nippon Ichi seems to have deemed this method a little too overpowered, though, and it was later removed through a patch. Said patch can be deleted (at the cost of save data already present), but it's pre-patched in the Vita port.
In the Vita version, item duping was made infinitely easier thanks to bio suits getting a unique skill that doubles their stats but turns them into neutral units, rendering them susceptible to the puppy paw stick. Also the puppy paw stick has a higher steal rate too.
Emizel, due to the basic fact that he's essentially a prism skull with the stats of a main character that you can get WAY earlier than a regular prism skull.
Emizel can be made particularly deadly if you have downloaded Mao. His "Weakness Detector" Evility increases damage by 100% when exploiting an elemental weakness. Seeing as the entire point of a Prism Skull is exploiting elemental weakness, and Emizel already has an Evility that boosts magic damage by 50% against individual targets, he will basically do 250% damage against any single enemy who is weak to that element. Then teach him the S-Ranked Tera spells. Compare that to the Adell example below, who maxes out at 230% with only one element (Fire). Oh, and Emizel can do it at range. The Vita version makes him even more ridiculous by adding the SS-Ranked Peta spells.
Tyrant Valvatorez is shaping to be this. His natural ability increases all the stats of any given weapon by 50%, and his two other evilities are even stronger: one increases his stats by 20% for every ally around him in the HQ (meaning he gets a whopping 80% bonus) and the other turns every enemy killed by him into a ally for the rest of the battle. The former is so broken that it can't be passed to other characters in the PS3 version. Then again, you'd expect nothing less from the famed Tyrant.
Adell somehow manages to become even more broken than in Disgaea 3. In addition to Fair and Square, he now has a secondary evility that boosts fire attack damage by 20%, which of course stacks with both Fair and Square AND Vulkan Blaze, meaning that he has an S rank attack with a free 50% damage boost.
You can do even better with Adell, if you've bought Mao pass on his weakness detector Evility, it gives you a 100% damage boost if you attack with the element that the target is weak to and if the target is weak to fire, well, it's probably gonna be deader than dead after a Vulcan Blaze.
That's nothing compared to what a Magic Knight can do for him. Give Adell Elemental Force combined with casting Fire Boost, making Adell's Fire Apt 99%. Cast Anti-Fire on an enemy weak against fire like the level 1 slimes in a certain episode 5 X-Dimension map, causing them to be -99%. You already have a net 228% Boost. Combine with a maxed out bonus and you get a 868% boost, not taking into account the bonus for S ranked attacks. For added lulz, give him two giant Cu Siths that have been fused with dragons, causing a double tapped ATK bonus to elemental attacks based on movement combined with 2 ATK bonuses for all attacks fired at him (which included normal hits that did no damage).
The Trick Move evility, which increases your evasion bonus by 10% within the turn. Put this on your character, give him MOV boosting equips, and keep moving 10+ spaces and watch your character become untouchable. One of the few ways to get an edge on Baal in the rematch.
The presence of the cheat shop makes it incredibly easy to level up characters, and the further you get into the game, the easier it becomes. It's possible to level up an entire party at a level called the Inner Sanctum (post-boss battle), by forming a ten character tall tower with a character with defence high enough to ignore the enemies there at the bottom. The enemies will automatically approach anything on the field as soon as something is deployed, so you don't have to move. By setting EXP and Mana gain to max and minimized HL gains, you can level up your characters very easily, so long as you keep the enemies at a level that's 8-10 levels below that of the character at the bottom. At chapter six, you can end up with a Laharl that's 200+ in a few hours, making the rest of the main story a cakewalk.
The cheat shop also affects HL and Mana gain as well, literally giving you Money for Nothing and more than enough Mana for those bills. Not to mention Rasetsu Mode, which raises the item level cap to 999.
Jack monsters have an incredibly powerful evility available. This evility reverses the effects of status effects, which are more common in this game than in previous titles. What this evility means is that, if inflicted with poison, they regenerate health. If inflicted with blindness, they become MORE accurate. If inflicted with deprave, they gain major boosts to all stats. Given that status effects like poison can still potentially kill even a 9999 level character if inflicted by a level 1 character and not dispelled (since poison works off of a percentage instead of a flat rate, and takes 20% of a character's health per turn) the character that can GAIN power from those effects effectively becomes a powerhouse. Teach one of these creatures spells that let them inflict status effects, and you can have them boost each other as they tear their way through your enemies.
As usual, the DLC characters include some:
Salvatore because her evility. It performs one of several randomly selected buffs to adjacent allies, but when the options are increasing movement by 10, range of attacks and spells by 9, jump by 99, doubling damage dealt, and cutting damage taken down to 10 percent of normal, you can't really complain.
Pram's evility includes poison (that always hits), a hit on a random enemy, a free 50% INT boost for all allies, a 100% Attack boost for herself and 50% evasion for all units.
Human Priere brings with her the Purify Power evility, which, when damaging a unit, spreads that damage to adjacent unit and all other after it with decreased damaged as it spreads further out. With the right setup, a character can clear an entire Item World floor. The best part is that the character with Purify Power gets all gains (EXP, Mana, HL, and even Land of Carnage stats) from every unit killed this way.
Christo comes into the fray packing an extremely powerful Evility that gives any adjacent ally perfect accuracy and 25% evasion, a potent heal that targets all allies in his general vicinity, and one of the strongest Overloads in the game (see below for that), all as soon as you get him in Chapter 2. As the story goes on, he obtains access to a solid 3x3 ranged combo skill with Usalia, another Evility that grants adjacent allies bonus ATK equal to 30% of his INT, and an upgrade of his already ridiculous Overload. Most importantly, you never have to worry about grinding for him. Christo's Evilities and Overload are so powerful that he can get away with being level 50 or so for the entire game.
Usalia is often considered among the best monsters in the series once you get past Chapter 10. She is known for being very hard to kill Stone Wall while having a very high damage potential without ever having to invest a single point into her attack. This is possible via her Precious People evility, which increases her ATK by 20% for each ally adjacent to her (meaning potential a maximum of 80%). This evility synergizes with Superlative Ally (Increases ATK of adjacent ally units by 20% of its owner's INT and applies BEFORE Precious People) and Petta's evility (Increase ATK of adjacent ally Overlord units by 30%.) Usalia's Overload Skill further synergizes with Precious People, working like Comet Disaster and then granting the Archer's evility with an infinite range as many uses as the party has available attacks.
Maids make for amazingSupport Party Members. Their Unique Evility, Efficient Work, lets them use one item without having it count against their "one action per turn" limit, meaning that they can move someplace, use an item, and then move again and take an action. One of their Evilities, Know How To Use It, doubles the effectiveness of healing items; you eventually unlock an item that refills 50% HP and SP, Curry Soup, and that Evility turns that item into a full heal, and Curry Soups can be mass-produced at the Alchemist in the post-game. Another one of their Evilities, Licensed Caregiver, expands the Area of Effect of healing items into a five-panel cross shape, allowing the Maid to fully heal, treat status effects, and spread permanent stat-boosting items for up to five units without any of them using their turn up. And finally there's their Signature Move, Afternoon Tea, which grants an Extra Turn to another unit. Every other active skill on this list that isn't an Overload can be used again.
The Sage has been accused of being significantly better than just about everybody else, and it sticks out like a sore thumb given how surprisingly balanced the generic classes were this time around. Their innate evility Mass Blaster grants them +10% extra damage for every unit they target, which works not only with spells but with any area of effect attack in the game. Their first unique skill is Multi-Attacker, which allows them to give an ally the ability to attack twice in a row for two turns, effectively doubling their damage. Worst of all is Land Decimator, the Sage's second unique skill and quite possibly the best attack in the game. It deals a very low amount of damage and only has a 50% hit rate, but it also targets every single unit on the map, which when combined with Mass Blaster makes the poor damage moot. She's no slouch against single targets either, as she can learn the Concentration Evility, which doubles the damage of single-target magic attacks. A sufficiently geared Sage can solo the entire post-game by herself, up to and including the Item World.
All of the DLCs are this, especially in the early game, as the characters start with comparatively high stats even at the earliest levels, along with very strong evilities (some of which remain viable well into the post-game). The prime examples include:
The aforementioned Adell returns in this game, in all his game-breaking goodness, perhaps even more so due to the Overload mechanic. It gives him 32 Movement and tripled attack power, which, in tandem with his unique evility (which gives him an extra attack if he uses fist,or his own unique specials) can get him to be an excellent boss killer.
Metallia very nearly renders the mage classes obsolete. She comes with spells of all the elements up to Tera level (as well as very good resistances to those same elements) with solid stats to use them, a 3x3 special, and an evility that revives her once upon death. She also brings utility in the postgame prisoner farming in the form of her Overload (see below) and another evility that decreases prisoner SP for effective torture. The fact that she can be unlocked immediately rather than being locked behind a DLC episode is just icing on the cake.
Valvatorez is also among the best DLC characters. His unique Evility Absorbtion is fantastic (absorb 5% of the stats of every unit he defeats, meaning he gets more powerful the longer he fights), his Overload which turns him into tyrant Valvatorez is likewise great (any enemy he defeats gets resurrected as an ally), but his *real* strength is in the Evility "Prinny Instructor". It increases the XP, Mana, and Class XP gain of any Prinny in the same Squad as him by 100%. Good by itself, amazing once you pass it out to other characters and then put them all in the Prinny squad, which makes all members count as Prinnies. Prinny Squad has a maximum of 10 members, so now all of them can get 1100% XP, even without the benefit of Statisticians or the Cheat Shop. Combine with Fuka's "Prinny Hat" Evility, which makes any character count as a Prinny regardless of Squad, and now you can do this trick with one of the Squads that allows 20 members, bumping the gain to 2100%.
Pram's Punishing Prophecy evility deals damage to a random enemy unit anywhere on the map at end of turn, meaning you could spend entire maps sitting there doing nothing while Pram snipes every enemy.
Then there's the FREE DLC prinnies, especially the one that has access to the first four tiers of elemental and healing magics and one with an Evility that makes its hp 100,000+ (Prinnies explode when you throw them, dealing half of their hp as damage). They also come with the "1 HL" Evility, which allows you to revive them at the clinic for only 1 HL.
Overloads are powerful, once-a-map abilities that can only be triggered in Revenge Mode. Some of them are simple stat boosts, but others are just plain brutal:
Christo's Occhi Clairvoyance grants a 30% boost to accuracy and evasion to all of his allies for one turn, temporarily making your team harder to kill while making the enemies even weaker. Even better, it's one of the first ones you get. The upgraded Evangel of Purity upgrades the bonuses of to 100%, making your team borderline invincible for one turn, unless you're fighting Baal.
Usalia's aforementioned Murmur of Rage is hilariously loaded. Just by triggering it, she deals damage to every enemy on the map, and transforms into her Berserk state. In this form, she auto-attacks any enemy who is hit, anywhere on the map a limitless amount of times until the form expires, and she swaps her old skillset for a 3x3, high damage skill.
Killia's Tyrant Revelio simply lets him take 3 actions in one turn. Considering he has access to a one-of-a-kind skill that deals monstrous damage to one target, a sufficient amount of boosts can allow him to destroy almost any boss.
Etna's Chaotic Ordina summons an army of Prinnies to fight for her. And we mean a lot of Prinnies. While their stats aren't the best, they are very effective meat shields for the rest of your team, and they can build up the combo meter to astronomical proportions, especially in conjunction with Usalia's Overload.
Metallia's Greedy Mekashefa is a capture attempt to every enemy on the map. It naturally fails against bosses, but that doesn't matter when it can remove all their support mooks in one transaction. Combine this with Double Fake (preferably the Carnage version), the Warrior's "Shaking Excitement" Evility (+3% stats per enemy unit on map) and powerful Interrogation Squad officers for good times.
Izuna's Comet Disaster is a simple Star-elemental attack to all enemies. In the postgame, put this on the aforementioned Sage class and it becomes Land Decimator but without the accuracy penalty or "target friendlies too" property.
Majorita's Broken Faith Magia, an Overload so strong that the game won't even let you use it until you unlock Void Dark and pass a bill to let Majorita have it back. This monstrous ability re-summons every single dead enemy under your control. For example, if you're fighting an Item God but you managed to clear all of the trash mobs in the room beforehand, you can summon them all to swarm the boss and deal a good amount of damage in the process. The best use of it is against Baal, where once you kill his avatars, you can summon them back to deal the finishing blows, with no hope for him to retaliate.
Petta's Future Eyre gives all allies +1 Overload use. No exceptions. Every Overload on this list can be used again.
Certain Evilities can also massively tilt things in your favor:
The Twin-Headed Dragon's Twin Head Evility allows for a second attack as long as the unit hasn't moved since the beginning of their turn. You can immediately attack twice, and then move. This can also combine with the Nekomata's Final Blow Evility — if the enemy survives with around 10% HP or less, you attack again!
Emizel's Death March grants a 2% damage boost per enemy defeated. Majorita synergies well with this, as her Queen of Coffins grants her a 10% attack boost per enemy beaten, and it can also stack with the Horseman's Combat High, which does the same thing. On a large map with plenty of foes, you can hit immensely hard.
On maps with plenty of foes (Double Fake and the Item World in particular), Warrior's "Shaking Excitement" Evility (+3% stats per enemy on map) really stands out to be more useful than Violence and when combined with other notable Game Breakers (Sages, Valvatorez, Metallia's Greedy Mekashefa Overload, Majorita's Death March and Combat High Evility combo, et al.) it can easily turn the tide on huge maps.
The Kunoichi has Nirrti, which grants a 10% stat boost per attack dodged. Not only can Forced Counter and Counter Dodge max out Nirrti's boost, but it also triggers on passive HP/SP restoration, such as the Zombie's Corpse Cannibal (3% HP/SP restored per enemy killed), the Fairy's Magic Generation (10% SP restored per turn), and the Spear Fisherman's ability (restore 3% HP per attack landed).