Anthropomorphic Personification: The gods are usually the personification of a certain thing, whether it's an element or otherwise, usually having a critical impact on it. There are also several other things that can fit into this catergory.
Ax-Crazy: Quite a number of characters, ranging from the intensely depraved Crucio, Carminella the Eldamis brothers, etc.
Aerith and Bob: Given the sheer amount of characters and the kind of place the story takes place in.
Badass: Many characters, due to usually being combat-hardened soldiers or incredibly powerful demi-god like creatures.
Empowered Badass Normal: Many characters (heroes specifically) have some sort of special item or ability or are the reincarnation of a powerful spiritual entity that grants them the strength they have.
Took a Level in Badass: It wasn't enough that the heroes and villains were as strong as they are— they get even more so as the story passes.
Black and Gray Morality: Despite having some unambiguously good people as heroes and some villains portrayed mostly as normal people caught in a bad spot, they oftenly have to do awful things to get along. Which is not even considering some of the nastier stuff such as Reversa's relentless execution force, Iduun cowing an entire nation to become a military state through racism and superiority overtones, the Eldamis Brothers' purely selfish and corrupt public deeds, Verus Amor kidnapping people and selling them off as brainwashed sex slaves, etc.
Cloud is purple or yellow depending on which part it is (Wind or electricity)
Death Is a Slap on the Wrist: Characters who use Abyss Knight-grade Valiant Crystals instantly regenerate from any mortal wounds. That is, unless you break the stone that they have somewhere on their bodies, making them similar to Liches.
Crystal Dragon Jesus: The Ten Origin Beasts are said to have created the universe along with its various realms of reality and all eight elements and have said to have "faded away" a long time ago.
Earth - Dishing Out Dirt and Green Thumb at the same time. Its only subcategory consists of what could be the most broken skill out of all the elements, which is using raw Earth power to break through enemy defenses. (Breaker)
Flame - Playing with Fire. Its subcategories consist of being able to touch or even dive into (in the case of lava) superheated sources without any negative effects other than risk of permanently becoming a magma creature (Infinite Degree) and being able to make your fire stronger, as shown by its ascendance into hotter shades of colors. (Pyrokinetics)
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), the basis of high speed techniques (Wind Slicer), and being able to use your power to help recharge energy sources. (Generator)
Evil Counterpart: Subverted in the case of the Deathmoon Family, which are just as good as the Lunardream Family.
Evil Feels Good: A lot of the villains enjoy being as they are. There are many exceptions, who usually outweigh the latter.