You have a base walking speed of 30 feet

Due to some quirk in the biology of thirens, they have developed some resistance to effects that wear one down or corrupt. When making a saving throw against effects caused by the environment, such as regional effects or environmental conditions, add 1d6 to your roll.

When creating a human thiren character, choose one of the following:

Bovine thiren

Summary: Bovine thirens possess some traits in common with cattle, such as horns, bovine ears, tails, and sometimes even splotchy hair patterns. They also tend to have large appetites.
Traits:
Ability Score Increase. Your Strength score increases by +2, and your Constitution Score increases by +1.
Gore. In a pinch, you can use your sturdy horns to defend yourself. Unarmed strikes with your horns deal 1d6 bludgeoning or piercing damage (player's choice at character creation).

Rodent thiren

Summary: Rodent thirens possess some traits in common with rodents, such as rodent ears, enlarged incisors, and tails. The ears and tail may have fur or lack it, though when they do, it matches their natural hair colour.
Traits:
Ability Score Increase. Your Dexterity score increases by +2, and your Charisma Score increases by +1.
Agile. Your base waling speed increases by 10 feet.
Gnaw. In a pinch, you can defend yourself with your enlarged incisors. Unarmed strikes with your bite deal 1d4 piercing damage.

Feline Thiren

Summary: Feline thirens possess some traits in common with small cats, such as cat ears on top of their head, slitted pupils, and furred tails (fur-less in the case of sphinxes). They tend to have a preference for rodents and fish.
Traits:
Ability Score Increase. Your Dexterity score increases by +2, and your Wisdom score increases by +1.
Cat physics: You have resistance to bludgeoning damage from falling.
Cat claws: You possess sharpened, retractable claws that can leave nasty scratch wounds. Unarmed strikes with your claws deal 1d4 slashing damage. Additionally, when climbing up a surface, your climbing speed is equal to your walking speed, though this does not apply to your climbing speed going down.

Carchar thiren

Summary: Carchar thirens possess some traits in common with sharks, such as pointy teeth, gills, and finned tails covered in denticles. Carchar thirens tend be lethargic when not engaged in an active task.
Traits:
Ability Score Increase. Your Strength score increases by 2 and your Dexterity score increases by 1.
Amphibious. You can breathe in both air and water
Fintastic swimmer. You have a swim speed equal to your walking speed.
Bite. In a pinch, you can defend yourself with a painful bite. Unarmed strikes with your bite deals 1d4 piercing damage.
Heavy tail. Your tail is tough and can do a lot of damage. Unarmed strikes with your tail deals 1d6 bludgeoning damage.

Fox thiren

Summary: Fox thirens possess some traits in common with foxes, such as large, pointy ears on top of their heads, slitted pupils, and large, bushy tails. Notably, the Hoshimi noble family of fox thirens lack tails.
Traits:
Ability Score Increase. Your Dexterity score increases by 2 and your strength score increases by 1.
Like a blur. Your base walking speed increases by 15 feet.
Leap. Your standing long jump is 20 feet and your standing high jump is 10 feet.