Given that there are various worlds with different types of supernatural energies.
Humans with no supernatural powers of any sort. Most humans on Earth are of this type and recently all humans on the Star Spirit World which had their Spirit Element power removed by Hajime's Party in order to resolve a conflict. Humans of the Factory World are also regular humans due to the lack of Element in that world.
Mana Element imbued Humans
The human race of Tortus is one of the most populous if not the most populous race on that inhabits Tortus. Unlike the humans of "Earth" or the "World of Sky", the humans of Tortus possess the ability to use magic due to possessing mana which allows them to cast spells with various effects. Unlike Demons or Vampires, Humans have a relative moderate understanding of magic.
There is a group of Earth Humans who were summoned by the so called "gods" and were blessed with Mana and forming the so-called "Hero Party". They were considered the strongest humans on the face of Tortus and Earth. Unfortunately, they've turned out to be the weakest due to their inferiority strengths of true Apostles, Demons, Vampires, Dragonmen and eventually hybrids of Monster such as Hajime.
Humans imbued with Mana will continue to generate mana from their own bodies even in worlds that lack a natural source of Mana like that of Earth and the Factory World, however their natural regeneration of Mana may be slowed.
Spirit Element imbued Humans
All residents of the Star Spirit World used to have the ability to use Spirit Element energy until concept magic was used on a grand scale by Yue to remove it due to how many of the residents of that world had abused the power and had to give it up amend the relationship they had with the Spirits and Lutria the avatar of the Star Spirit Tree.
Blessing Power imbued Humans
Humans of the Desert World had the unique ability to use Blessing Power which was tied to the life nature of that world. However due to the ability to use Blessing Power and the Blessing Element tied to their very souls, the inhabitants of the Desert world were especially vulnerable to the Dark Powers of the Dark Beings that drained their life force. Other humans that whose supernatural abilities are not derived from Blessing Power are unaffected by the draining and poisonous nature of Dark Beings.
Human/Monster hybrids are rare species of humans who gained monstrous appearance and inhuman strength through mutations from consuming Monster' meat and drinking liquefied mana. Their original bodies changed into muscular and taller body. Their strength, speed, senses are stronger then beastmen and ordinary Monster. Their mana is even more powerful than normal mana blessed humans, and demons as their strength and abilities are completely inhuman and monstrous. Due to withstanding the fatal ingestion of monster flesh, they can further increase their stats and gain the special magic/skills of the Monster that they absorb. They have purple spiked bloods cells, red tattooed-like veins even both their hair turned from original to white and eyes turned to crimson red. Their mana turned from normal to crimson. They are not in fact, humans anymore. They can break bones and damage organs of humans (including those who are blessed with physical abilities). They are highly intelligent even more than normal intelligent humans. According to Cattleya, if the hybrids are anything like the ordinary Monster, both of their monstrous and inhuman strength were checked out. Only Restoration magic can recover a Human/Monster hybrid's full condition.
Zombies also known as the Undead, are deceased humans who are reanimated from the dead. For normal zombies, They are eater that eats living organisms. They don't have their human memories. They are infection and disease when bite or scratch turn them into zombies.
In Tortus, zombies who are reanimated by Eri Nakamura are not eaters but rather soldiers who are controlled by Eri as puppets. They're not in fact, infected or a disease either. Their souls were tormented and enslaved by Eri to force them to do her bidding. The only way to free the souls of the dead is to destroy the entire body or head. Their strength paled in comparison of a hybrid Monster or powerful weapons developed by Hajime.