Isekai World

Humans' overall stats decrease in cold, heat, and water.
Werewolf gets a 100% bonus to CON and DEX during the night, also a 50% bonus to STR, but a -2 to INT.
Feline Man gets a bonus when in forest terrain: a 50% bonus to DEX and STR.
Semi-Demon grants a 75% bonus to WIS, STR, and DEX in warm locations.
Undead: 300% bonus to CON during the night, but 50% less STR.
The Slime has a +10 DEX, a +10 STR, and a -20 CON when in water.
Orcs get a 100% Bonus for 5 seconds when the opponent has taken away half of their health and the orcs have not hit a single blow.
Mutant gains a +1 to all its stats when it touches a new living being, whether flora or fauna.
When a demon is angry and/or in hellish places, it gains a 50% bonus to all its stats except INT.

Human Kingdom

Climate: Temperate
Terrain: Fertile lands and rivers
KING: Edric Row (Tired of so much war, strategist.)

Relations:
Velkarun's business partner.
Religious tensions with Solmyr.
Neutral with everyone.

Common monsters: Goblins, Wolves, Slimes.

Adventurers' Guild:
New Life Guild
Ranks: Copper → Silver → Gold → Mythic

Army:
Human army.
Heavy infantry.
Mandatory conscription if you are born in Aldryss.

General Maria:
Species: Human.
Specialty: Heavy Infantry.

Personality throughout history:

Human: If you are human, he will help you with whatever you need, and you will help him in return.

Demi-Human: If you're a Demi-Human, they won't be much help, as they're prone to betrayal. If they betray you, they'll sell you into slavery.

Monster: If you are a monster, mercenaries will be looking for you when you enter Aldryss.

STR: 16
DEX: 12
INT: 25
CON: 16
WIS: 18

Personality throughout history:

Human: She will remain neutral; if you help her or demonstrate your abilities, she will teach you some techniques.

Demi-Human: Initially distrustful, but if you manage to gain friendship points, she will be a great ally who will help you escape slavery in case of King Edric's betrayal.

Monster: Hostile, if it sees you it will try to eliminate you.

STR: 25
DEX: 12
INT: 16
CON: 22
WIS: 12

Hybrid Kingdom (Humans and Demi-Humans)
Climate: Polar
Terrain: Glaciers and mountains
QUEEN: Skadi Hjörndottir (Cold, honorable. She is able to control the storms that help keep her people safe.)

Relations:
In a cold war with Thumbra.
Mutual respect with Velkarun.
Ignored by the other Kingdoms.

Monsters: Yetis, arctic wolves, ice spirits, white dragons.

Adventurers' Guild:
White Fang
They only accept warriors resistant to the cold.
Specialists in dragon hunting.

Army:
Tribal warriors.
Use of domesticated beasts.

General Ulf:
Species: Demi-Human.
Specialty: Barbarian.

Personality throughout history:

Human: If you are human, it will not help you unless you are able to kill a White Dragon. Upon defeating a White Dragon, it will help you when it can and from the shadows; if you gain a good reputation, it will invite you to be its king.

Demi-Human: He will invite you to his kingdom to escape human evil; you will be able to join the guild more easily, but you will not be able to become king.

Monster: He will let you stay in his kingdom, but he will not help you.

STR: 22
DEX: 16
INT: 16
CON: 19
WIS: 14

Personality throughout history:

Human: Ignores you completely.

Demi-Human: Ignores you unless you defeat the White Dragon, in which case he may help you become a dragon hunter.

Monster: When it sees you, it will try to attack you. If it wins, nothing will happen. If you win, it will teach you how to improve your technique.

STR: 28
DEX: 12
INT: 9
CON: 25
WIS: 13

Expansionist Kingdom (Humans, Demi-Humans, Monsters)
Climate: Scorching, Volcanic.
Terrain: Black soils, active volcanoes.
Emperor Zarvok (A visionary tyrant, he seeks to rule the entire world in order to control and unify it. He is capable of controlling fire and turning people into demons.)

Relations:
Hostile towards everyone.
Main military threat.

Monsters: Demons, Fire Salamanders, Lava Golems.

Adventurers' Guild:
Blood Sword
Adventurers work directly for the empire.
Secret missions, assassinations, and sabotage.

Army:
Imperial Legions.
Fire Mages are mandatory.
Extreme discipline.

General Kharon
Species: Monster.
Specialty: War Mage, Incinerator.

Personality throughout history:

Human: He will be indifferent unless you destroy a hidden military base. There, he will offer you gold and women to become a secret ally. He will ask you to gain Skadi Hjörndottir's trust in order to conquer Frosthall. If you succeed, he will let you keep Skadi Hjörndottir.

Demi-Human: If you attract his attention, he will give you resources so that you can join him in his lands.

Monster: He will recruit you as soon as he finds out about you.

STR: 22
DEX: 9
INT: 25
CON: 16
WIS: 15

Personality throughout history:

Human: Indifferent.

Demi-Human: Indifferent.

Monster: Indifferent.

STR: 12
DEX: 12
INT: 28
WITH: 12
WIS: 23

Fairy Realm (Fairies, some Demi-Humans.)
Climate: Humid, eternally spring-like
Terrain: Conscious Forests
Queen Eilunara Eternal Root
Species: Semi-forest spirit (Serene, ruthless with invaders.)

Relations:
Spiritual alliance with Solmyr.
Distrust of humans.
I absolutely hate Velkarun.

Monsters: Giant Spiders, Dark Fairies.

Army:
Elven guardians.
Creatures of the forest.
Natural magic.

Mixed kingdom
Climate: Tropical on the surface, frozen abyss
Terrain: Islands and underwater cities
King Nereth (Calculator, Patient. Partial control of the ocean.)

Relations:
Maritime trade with Aldryss.
Neutral in land conflicts.

Monsters: Young Krakens, Sea Serpents, Lesser Leviathans.

Adventurers' Guild:
Wandering Fleet
Specialized in naval missions.
Exploration of submerged ruins.

Army:
Dominant marine.
Marine mounts.

General Kaela
Species: Human blessed by the sea.
Specialty: Amphibious combat.

Personality throughout history:

Human: He will be indifferent, although if you manage to do something good for his kingdom, he will give you a mount so you can move faster and he will be attentive to your actions.

Demi-Human: He will watch you when you enter the kingdom to see if you are of service to him. If so, he will ask you for numerous favors.

Monster: In most cases, it will not let you into the kingdom. If it does let you in, it will turn you into a mount or a war slave.

STR: 16
DEX: 12
INT: 22
CON: 19
WIS: 18

Personality throughout history:

Human: Surprised to see another human.

Demi-Human: Indifference to how commonplace they are.

Monster: You are not fit to enter the kingdom. You will be its mount.

STR: 22
DEX: 19
INT: 16
CON: 19
WIS: 11

Mixed Underground Kingdom
Climate: Dark, humid
Terrain: Infinite caverns
King Noctyrr (Humanoid being, nothing is known about his personality or abilities.)

Relations:
Covert war with Frosthall.
Secret dealings with Velkarun.
Spies everywhere.

Monsters: Living Shadows, Abyssal Spiders, Dark Chimeras

Army:
Elite troops.
Surprise attacks.
Psychological warfare.

Personality throughout history:

Human: You will always see it at the edge of your eye, but if you turn away you will see nothing. It will appear in your dreams, but it will not do anything to you... unless you destroy one of its bases.

Demi-Human: Indifferent.

Monster: He will watch you closely, you will see him physically, you will see that he will only see if you are of any use to him.

STR: 9
DEX: 16
INT: 25
CON: 12
WIS: 25