In a villain's case, Kefka is revived from his demise, but since he lost the power of the Espers and the Warring Triad, he's reduced to basically nothing. He plans to fix this with the Life Eater, though.
Big Boo's Haunt: Like in its parent series, cemeteries are always crawling with zombies or ghosts at night. For a prominent example, there's the Graveyard Palace, which is absolutely colossal in that it's a wasteland populated with nothing but gravestones. At the end, there's a mansion filled with vampires.
There's also the first part of the Trial of the Earth Silence Gem - The Terra Catacombs, specifically. And it's located below the City of Adventure that serves as the hub for the heroes... Sweet lord.
Blood Knight: Quite a bit of characters. Even one of the main characters (i.e Meiko) is defined by this.
Bystander Syndrome: Averted, for the most part. One prominent example - Shining Advent was founded by Lelus and Attemi for the very reason of protecting Crypton Province from all the crime and misery because they felt like they could make a difference.
Character Title: Rising Star is Miku's hero form from the past— and Miku's the main character, so it all fits.
Crisis Crossover: Pandora brought all the heroes she did (from multiple franchises and Starlit Heroics related) so they can face not only the Apocalytes, but anyotherthreat that showed up along with them.
Dream People: Literally— Madotsuki and Urotsuki, due to their new powers, are able to materialize the beings from their dreams into reality.
Eldritch Location: The Dream Realm is infinitely changing and is incomprehensible to even demons and angels in its rawest state. That is, excluding for one location that serves as the secondary base for the Apocalytes.
Earth - Dishing Out Dirt and Green Thumb at the same time. Its subcategories consists of the mostbroken skill out of all the elements, which is using raw Earth power to break through enemy defenses (Breaker) and using Earth power to boost your own endurancy. (Defender)
Frost - An Ice Person and Making a Splash respectiveably, due to it mixing together Ice and Water. Subcategories consist of being able to breathe underwater (Aquatics) and being able to turn water into ice and vice-versa. (Hydro-Puppetry)
Cloud - Blow You Away and Shock and Awe, thanks to it being a mixture of Wind and Lightning. Subcategories consist of being able to fly (Aviary), using your body as a living energy source (Generator), and being able to move really fast (Wind Slicer).
Exotic Eye Designs: Valentine's cross-shaped irises. There's also characters turned into the Skullgirl who gain skull-shaped irises. There's also Tone Rion, who has heart shaped irises.
Eye Scream: Action52 and Double alike have eyes embedded on their bodies, along with several other things that are just wrong.
Power Levels: While it is supplementary material, it is HEAVILY influential on the actual measuring of characters' strength. Not only that, it's measured in Disgaea-esque levels. It is also very strict and defined, meaning that it will never stray away from the formula.
Levels 1 - 100 = Normal human beings and the like. This is what the majority of Earth is like.
Levels 101 - 1000 = The average strength of Divixerans (Divixus being the planet where the story takes place on), usually due to better technology, elemental influence and overall better abilities. This also applies to creatures that live on the planet and the other alien species spread throughout the universe.
Levels 1001 - 2500 = Practically the levels where any spiritual being such as angels, demons, and so on lie in, thanks to living on an advanced plane of existence and therefore have a greater limit onto their abilities.
Levels 2501 - 4000 = Demigod levels. Practically the highest levels a spiritual being could ever reach, it is reserved only for Demon Overlords, Seraphims, Archangels (2500 - 3000), the Two Families' monsters (Lunardream and Deathmoon alike), Apocalytes (at their best) and Nachzehrer (black blooded demons with the highest potential out of any creature in the universe)
Levels 4001 - 9999 = God levels. This is where things get serious, because when anything gets this high, nothing can rival them. This is the level where entities can shift reality and bend the cosmos to their will - and it's very, very specific, as becoming a god is practically impossible - there is no real way to do so.
Precursor Heroes: Certain members of the Twelve Holy Disciples had a counterpart back in the first Apocalyean War, such as the avian warrior for Peacock and the Nightmare Sealer line of heroes for Urotsuki. Subverted with the main eight Vocaloids, who are described to be the representatives for the Vocaloid heroes for the past but are actually the same person with amnesia and have suffered a forced Bag of Spilling.
Predecessor Villain: Alternatively, the same applies to some Apocalytes - Madotsuki is the newest member for the infamous Night Weaver line of villains who served to fight against the Nightmare Sealers. Also, Monochroma is destined to become the new Skullgirl after Marie.
Recurring Element: No matter how many new franchises with their own rules are thrown in, they will all get adapted to the Starlit Heroics universe in one way or another. The elements system is a prominent example, as it applies to every single character that appears, regardless of what they belonged to previously.