- Anti-Climax Boss: The optional encounter with Asagi must be unlocked with a level 1000 character and a massive amount of mana. Asagi herself is level 50 and will likely go down with one hit.
- Awesome Ego: Zetta is arrogant, hammy, and boastful, which is the reason for a lot his fans.
- Base-Breaking Character: Petta. While she's won over plenty of fans with her cute design and adorable interactions with Zetta, several others see her as a lame attempt at tacking on another Token Mini-Moe to a Nippon Ichi game that is unusually low on them. The fact that she shows up much more frequently than any other characters besides Zetta and Pram in the other games also leaves a bad taste in their mouths.
- She may have won more fans after Disgaea 5. This being due to being a superb gun/support character with an Overload skill that allows other Overloads (including really deadly ones like Tyrant Revelio and Murmur of Rage) to be used twice per battle. Note: the language in the US version is misleading, making people think Overloads have to be already used for Future Eyre to work, when it's actually "+1 use per battle".
- Big-Lipped Alligator Moment: When King Drake powers up to fight Zetta, making bold proclamations about his true power, a random image of an old man riding a motor scooter appears on screen, embarrassing poor Drake. Zetta apparently recognizes the picture and tries to inquire about it, but Drake yells at him to forget about it and the picture is never brought up again.
- Ear Worm: "Sabat", the main hub theme, will get stuck in your head. It's been offered as an option for base music in every following game that allows you to change the soundtrack for a reason.
- Ensemble Dark Horse: Alex is quite fondly remembered due to his high number of funny moments as well as his cool design. After a long period of absence, he has managed to become a recurring DLC character in the most recent Nippon Ichi games alongside staples Zetta and Pram, something most of the rest of the cast has never enjoyed.
- Funny Moments:
- Game-Breaker: Zetta. He's the Badass Freakin' Overlord, and NIS made sure of that by making him Purposely Overpowered when you play as him at the beginning of the game and when you obtain his body during one of the optional battles. Simply put, he has the highest stats, the highest aptitudes, and the highest growth stats and skills in the game. There's not a single character in the game that can match him statistically, and this is all helped by having a very versatile skill set thanks to his access to varying types of swords.
- Game-Breaking Bug: Characters can sometimes get stuck in vehicles and facilities with no way of getting them out. Death is often one of the triggers, but not always. It's unfortunately very random and the only way around it is to reload a previous save.
- Good Bad Bug: The game prevents you from using more movement points than is logically possible (if you can't go from point A to point B in a straight line, you can't go as far as the movement circle indicates). However, if you wait as close to your starting point as possible, you can move with the remaining movement points from that point on (because the game assumes you went there in a straight line anyways).
- Ho Yay: Alex's obsession with his rivalry with Zetta makes it easy for fans to see that there may be more there, especially once he starts helping Zetta for the sake being The Only One Allowed to Defeat You. And then there's his Bad Ending where he actually defeats Zetta. He spends billion of years trying to find another enemy worth fighting, only to realize that his life is empty without Zetta.
- Marth Debuted in "Smash Bros.": Remember Petta, the Badass Freakin' Overlord's daughter? She was part of the content of the Updated Re-release that is exclusive to Japan. Despite this, she appears in Disgaea 4: A Promise Unforgotten, Disgaea D2 A Brighter Darkness and Disgaea 5: Alliance of Vengeance; games that made it to the west.
- Moral Event Horizon: Seedle nearly raping Salome in his backstory. It's already a rather disgusting crime on its own, but what really makes this monstrous is how obsessed he is with destroying Salome and everyone who cares about her because of the humiliation of dying to the woman who didn't let him have his way with her.
- In Japanese, Zetta's self-declared title is Saikyou no Maou, the strongest Demon King. Although variations of the original title exist (Strongest Overlord in the Cosmos), he commonly refers to himself as one Badass (Freakin') Overlord. Guess which one fans preferred?
- The title of the game itself was originally called Phantom Kingdom in Japan. It was supposedly renamed in order to remove any confusion about it being related to the previous game, Phantom Brave. Since the setting is much closer to Disgaea than Phantom Brave, this makes a lot of sense.
YMMV / Makai Kingdom