Your abilities can take a few forms.

Technique, Style, Passive, and Auto.

A technique is an action where you do something.

A style is a method of preforming actions.

A passive is an enhancement or attribute that remains on.

An Auto activates when certain conditions are met. An example is Limit when you are critically Low on HP you empower yourself with all tree other forms of abilities. Another example is a shield that automatically activates when you are attacked for the first time in combat.

A condition allows a character to empower an ability such as having Critically Low HP.

I may have to assign Conditions myself if an ability proves to be stronger than anticipated.

Abilities can be learned according to your grade but you may only learn Autos after Major Milestones. The choosing is one example of a Major Milestone. Those scoring over 100 will get their first before the Major Milestone.

These abilities should consider function over damage. Theres no cool downs either. Youll have to judge if an ability needs a certain time to recharge in character. Abuse leads to weakening.

I would recommend keeping your abilities to cover your character's weaknesses instead of enhancing any single attribute.

Once youve made the choice in character you are free to create an ability. AA you may do that now.