Everything you need to know about the quirks and how to get them is in the book you get when you load the datapack.
Explosion (ID: 0)
Engine (ID: 1)
Zero Gravity (ID: 2)
Hardening (ID: 3)
Acid (ID: 4)
Healing (ID: 5)
One For All (ID: 6)
Invisibility (ID: 7)
Half-Cold Half-Hot (ID: 8)
Electrification (ID: 9)
Cremation (ID: 10)
Permeation (ID: 11)
Gas (ID: 12)
Hellflame (ID: 13)
Pop-Off (ID: 14)

Open ingame menu:
/function quirks:menu (takes the player to an ingame menu, navigate your way to other commands from there)

Commands included in the menu:
/scoreboard players set @s quirkizer (value) (sets your quirk to the specified ID. Only works if you already have a quirk)
/function quirks:removequirk (removes your quirk so you can recieve a new one from the book)
/tag (player) add quirkless (used for disabling quirks for specific players)
/function quirks:getbook (recieve a book of quirks. "/trigger getbook" also works)
You can also:
Disable specific quirks
Disable villains

/trigger get_book (recieve a book of quirks)
/trigger toggle_notify (toggle datapack notifications, including villain attacks, etc.)

Villains: 15+ randomly spawning villains can spawn in your overworld for you to defeat, some of which have their own unique abilities. (villain spawning is turned of by default because as of the moment there is really no point of defeating them since you don't get any reward. They can although be enabled in with "/functions quirks:menu".)

- more quirks of course (decay, warp gate, etc.)
- rewards for defeating villains (Experience points, emeralds, hero of the village effect, items? resources? tools?)
- abilities for all villains
- book of quirks overhaul (it really needs some work)
- more commands + customization
- hero organisation HQ + hero license, maybe villain HQ (not sure what I want with this but I have some ideas)