okay heres my reasons
Zell- If you get him up to lvl 100, and have 100 ultimas junctioned as strengh then during his limit "duel" he hits 9999, and theres two basic ones i forget their name but they reguire two buttons to be pushed. You can hit them about 2 maybe three times a second so when you get time off 11 seconds times 3 = 33x 9999 = you do the maths.
Squall- pretty obvious no need talking about it.
Irvine- best ammos ap and fast with fast ammo if you have a controll that reads you tapping R1 as you just hold it down then you do over 150 000. Ap ammo you do 50 000 per limit.
So there you go squall leonhart 989