I'd say Head Captain Yamamoto's.
If we'd have seen Aizen's, his may have surpassed Yamamoto's. Seeing as it's Shikai form was enough to fool him.
Ichigo's is pretty powerful, but then that's mainly because he combines it with his Hollowfication. Even then, it doesn't surpass Yamamoto's.
Once Hitsugaya's and his Zanpakuto have matured, he may be able to surpass Yamamoto. He is also often called a 'prodigy'.
Shikai: Hyorinmaru Bankai: Daiguren Hyorinmaru
Hinamori hasn't achieved bankai yet, just shikai.
Ichigo is the only soul reaper with a compressed bankai.
Up+X activates the Bankai it depends if you SR bar is at 0%.
Its the same as his normal bankai, Tensa Zangetsu, its just after his training in the Dangai.
Probably Yamamoto or Aizen.
You need level 4 Soukatsui for Bankai, my sword is the best, its called bailing, epic bankai.
Shikai: Hyorinmaru Bankai: Daiguren Hyorinmaru
Although some Shinigami posses different stages of bankai, there is no level higher than bankai.
Ukitake's Bankai hasn't been revealed yet, only his shikai has.
he does he says "shoot to kill, shinso" and it literally shoots to kill. i don't know if that is his bankai or if his bankai is when his sword turns to dust. The sword pieces have poison in them, so they kill the opponent...i dunno which one is the actual bankai, but i hope it helped :)
NO
The word bankai is japanese. it means full release in english
his bankai is called Raika Goen Kaku which means lightning flashflame shell.
Answer:"dance sode no shirayuki is her shikai." It has not yet revieled that she has a bankai.
Hinamori hasn't achieved bankai yet, just shikai.
Ichigo is the only soul reaper with a compressed bankai.