All races listed here require Pehkui and Extra Keybinds - Origins:
Pehkui: https://www.curseforge.com/minecraft/mc-mods/pehkui
Extra Keybinds: https://www.curseforge.com/minecraft/mc-mods/origins-extra-keybinds
Github Link to datapacks: https://github.com/Connor3001/ConnorsOrigins

Size Shifter

Passive Abilities:

• While in your small form, you can climb blocks
• You don't take fall damage

• You deal less damage (x0.75) damage
• You can only eat meat
• You get hungry much faster
• Your cannot use a shield

Active Abilities:

[PRIMARY] Grow Self - You can change your size up to 4 times larger than normal.
[SECONDARY] Shrink Self - You can change your size up to 4 times smaller than normal.
[TERNARY] Grow Others - You can make any mobs in a 5 block radius smaller (Including players now!)
[QUATERNARY] Shrink Others - You can make any mobs in a 5 block radius smaller (Including players now!)

Size Shifter LIMITLESS

As requested; a limitless version of the size shifter, you can now grow as big or as small as you'd like!

Same abilities as the size shifter, but this time, without limits!

Time Manipulator (Not Recommended for multiplayer use)

Passive Abilities:

• While you are freed from time, and time is slowed, you can walk on water
• You are immune to fall damage
• You are slightly transparent
• You can only eat meat
• You are weak when in confined spaces

Active Abilities:

[PRIMARY] Increase Time Speed - You make the speed of time increase for all entities.
[SECONDARY] Decrease Time Speed - You make the speed of time decrease for all entities.
[TERNARY] Free Yourself from Time - You can detach yourself from the current time speed, moving and acting at your normal pace

Omnigin (VERY OVERPOWERED)

Passive Abilities:

• All origin passive abilities

Active Abilities:

[PRIMARY] Phantom Form
[SECONDARY] Enderian Pearl
[TERNARY] Toggle underwater vision
[QUATERNARY] Toggle spider climbing
[QUINARY] Upthrust
[SENARY] Open Shulker Inventory

Note: these datapacks do work without the Extra Keys mod, but you wont be able to use the Ternary and Quaternary abilities