Personally I only had 3 suggestions for opening this thread

1: address edo minato, in multiple ways

stop putting him in every single event cycle, he has been in fuku more than any other character ever, and has been in more redeemable events than any other character already.

fix his breaks, whether the skill or the description itself, the description currently says it increases evasion against standard attacks by 50% but that is nonsense, I have 25k combo, I dont know if that is low or not but mine cant dodge anything, yet players with 1/10th my power can dodge every standard for 10 rounds. Ideally I would say lower the dodge rate, I am sharing my personal experience, but that is not the basis for my suggestion, I dont care if I personally have a broken minato, the characters dodge skill is op and that is what I suggest be nerfed

2:address kushi red hot: maybe reduce the rate of her scaling abilities or the 20% health recovery

3:address gaara kk, giving him the strongest self heal is broken,

remove or even simply reducing it ,no, not the same rate as bee, I used bee as an example to show how broken gaara is, gaara already has super armour and scaling def/res which offsets the need for such a strong self heal, if he has to have it, it should at least be lower than that of bee.

Those were my suggestions for opening the thread, the other characters you mentioned you would need to wait for replies from others, none of the characters you mentioned below minato are ones that I personally think need nerfed, definitely not ibiki/summer kakashi/summer kurenai

I cant remember the username but somebody summed up summer kakashi perfectly, he is a glass cannon, he buffs attack/nin but weakens def/res plus he is pretty fragile from the get go, if you have a full buff/bltz/high combo team you can maybe take him out of the picture in round 1, the only problem is init, if you dont have the init then it is a problem because surviving his undodgeable buffed mystery is tough, but then again any first position character with higher init than you is a problem.

In that case you would need tanks/healers and/or units to remove any other buffs/barriers on kakashis side of the field, he is tough thats for sure, but he is manageable

as for kurenai summer, her mystery is nice but she is not OP, her mystery is useful but fire main, edo itachi, regular kurenai, ningendo can reflect it

and as far as I know unlike edo itachi and ibiki there isnt a chakra requirement to remove the status so any debuff clearer/healer/slug summon can undo it.

I wont dimini* if she is challenging to newer servers, but overall in the current state of the game she is a nice support, but nothing you can't contend with