Abilities for each character

Hey guys, im doing a game which is a 2d turn base 1player vs 1 player. Each player chooses 3 characters from a pool of multiple characters. I did the characters using scriptable objetcts. I want each character to have 4 skills(skills are just click on them and click on the oponent you want to use it on) and a passive, each skill i think its going to be a function because they all do diferent stuff ( some are similar).
My question is how do i "associate" 4 skills to each character ? What do you guys think its the best way, thanks in advance!