ive seen 118 eps of bleach so far and ive more or less seen all the bankai's and just deciding who's is the best, well i think mine is Byakuya Kuchiki in my opinion,who's bankai do you like?
No, 'bankai' literally means 'final release', and it refers to the second released form of a shinigami's zanpakutou.
The sword that doubles the weight of anything it cuts is not a bankai, and the hollow mask is unrelated to any bankai.
It's just him using his innate hollow power that he 'gained' from just barely escaping turning into one.
Izuru Kira
* Rank: Lieutenant
* Voiced by: Takahiro Sakurai (Japanese), Grant George (English)
Izuru Kira (吉良 イヅル, Kira Izuru?, romanized as "Iduru" in Bleach Official Character Book SOULs) is a friend of Momo Hinamori and Renji Abarai from their days in the Soul Reaper academy. They are often seen spending time together, and all joined 5th Division together. Though no longer in the same division, Kira is loyal to both his friends and his duties, perhaps to a fault. He defends his captain from a grief-stricken Hinamori, and later calls himself a "monster" raising his sword against her. He is the first in the 3rd Division to accept their new captain, Shūsuke Amagai, and tries to convince his peers of Shūsuke's trustworthiness.
Kira's zanpakutō is Wabisuke (侘助, Wabisuke? lit. "miserable man", but can also be translated as "apology", Viz: "The Penitent One"). Its release command is "raise your head" (面を上げろ, omote o agero?). When activated, Wabisuke's blade bends into a square hook. In this form, Wabisuke doubles the weight of whatever it strikes. The effect is cumulative, so each following hit exponentially increases the weight of the target. Thus, after seven or eight blocked attacks, his opponents are unable to lift their own swords. Once Wabisuke's effect becomes noticeable, Kira's opponents often fall to their knees with their heads bent down, as if in apology, thus the name of his zanpakutō.
Ikkaku's bankai is pretty badass.