I) Konoha Legend
In order to be able to unlock the combination, you will need 4 characters of different levels required according to the chosen Skill.
It’s recommended to have a minimum of 4 red characters to be able to acquire these skills but orange characters can also be added.
Same principle as Konoha legend combination.
III) Extra Skill for different combinations
Have the required characters and their stars so that you can unlock additional skills depending on the combination you choose.