Naruto: Nine tails wrong w/o the kyuubi naruto is still a kage level ninja
Kakashi: Sharingan kakashi was a jonin at age 13 without the sharingan
Nagato: Rinnegan true
Kisame: Samehada kisame without the samehada can still use all of his abilities and he tanked 7th gate without it
Gaara: Sand true
Onoki: Dust release no lol he only used dust release once, and he has three other elements
Mei: Bloodline limits still has those elements that make up that KG
Danzo: Izanagi still has shisui's eye and his wind element ability
Itachi: Susanoo -__- what? he was an anbu captain before he even unlocked MS
Minato: FTG
I didn't say that they were weak without them i said that they were not as good without them since they are the persons strongest techs.
Naruto: would not be able to spam clones or rasengan,he couldn't go KM mode and he will be able to use sage mode for very long.
Kakashi:Yes but he can do raikiri more time now thanks to sharingan. He also uses it to copy jutsu's and he would not be called the copy ninja without it.
Kisame: he would not be able to go shark mode or absorb chakra.
Onoki: Yes but that's his strongest jutsu and if you took that away from him then he would be downgraded.
Mei:Yes she does but mist and lava are her stringest kekkei genkai's and without it she would be nowhere near as strong.
Danzo: I forget about shisui's eye.
Itachi: Itachi without susanoo would not have totsuka or yagatama or a good defense. It is his biggest trump card and without it he would be seriously downgraded. He can't seal anything and it his strongest defense. Without it he has fire style,MS and intelligence. It is strongest move and he would not be at the level his is right now without it.