% increase based on base stats or post mods stats?

I do not have the information exactly like you are asking, but I am sure that if you want to know, you can probably figure it out by looking at character mechanics on SWGOH.GG . They have breakdowns of exactly how characters act in-game, so I wouldn't be surprised if they have the answer for you there.

Q: Leader abilities that increase some stat by a % apply to base stats or to stats after mod effects?

A: After mods


Q: Same question for buffs

A: After mods. If leader/unique affect same stat, they add up and then applied.
Say leadership adds +30% offense and you get offense buff, you get +80% offense (50+30)

"Juzz;c-1898567" wrote:
Q: Leader abilities that increase some stat by a % apply to base stats or to stats after mod effects?

A: After mods


Q: Same question for buffs

A: After mods. If leader/unique affect same stat, they add up and then applied.
Say leadership adds +30% offense and you get offense buff, you get +80% offense (50+30)

Thanks a lot. That was super useful. Cheers.

For the percentage based stats (CC, CA, Potency, Tenacity, evasion, accuracy) it works like your first example (additive percents). If you have 50% CC after mods and a leadership adds 30%, you would have 80% CC against enemies of the same level. (Note there is some (unknown to the player base to my knowledge) reduction of effectiveness against enemies of a higher level. TB, particularly LSGTB, is a common example where this is seen.)