About potential I have a question:
Do u mean for their single category,or for an absolute?????
Because it's different to say Hitsu has the biggest potential as a shinigami///Hitsu has the biggest potential between all bleach characters.
U should separate into different categories:
Biggest potential as a shinigami:HITSUGAYA
Biggest potential as a Vizard:ICHIGO
Biggest potential as an arrancar:WW (waitin in the future to see others,but usually genius kid still goes over the top)
Strongest characters at the end of bleach:Ichigo......but saying that the second will/can be Hitsu is too much....shinigamies has limits they can't surpass,we don't know if Human(Ishida/Chad) can surpass them,but we know that REAL VIZARD/REAL ARRANCAR(goes beyond shinigami limits).....
To be clear:I say REAL/COMPLETE VIZARD,cause havin your hollow power as a battery supply,and having it totally merged/fused with your shinigamies,are different things IMO.As we see arrancar are more developed cause they don't have such limit.....
Human limit: both Chad and Ishida reached a level (between VC and CPT),in respectively few months and few years.While most of shinigamies needs from 30/50 to 100 years......and they r still young.....
By comparison:Ryuken close to Isshin(POWERHOUSE maybe RG)...says a lot about Quincy potential...
By mentioning: Urahara said that Chad can acquire the power of bankai,but he was worried that his power were similar to that of hollows.....wich still doesn't mean that he has hollow limits...
I am going to say Yachiru has the most potential.
She is by far the youngest character and she happens to be vice captain under kenpachi of all people. By the time she is the age of Hitsu, she could well be a captain. Perhaps even before then.
Hitsu of course would be my number two. He has potential to be the second yama, and probably will be in a thousand or so years.
Ichigo is obviously going to be the strongest, but given time, I think Yachiru and Hitsu will probably overtake him.
Thus, my theory is since Ichigo is natural Vizard not induced forcefully like the others, he has the most potential. Furthermore, as people said in previous posts he went from human level to above average captain level in one year. Everybody else needed from 50 to 200 years to achieve that, therefore, Ichigo is an exception and is climbing levels like crazy very fast.
A perfect mix of shinigami and hollow powers would be limitless, becoming a new being with brand new powers both shinigamish and hollowish at the same time. Ichigo has limitless potential: his only serious obstacle is the total lack of time, lol.
Give him 100 years to train seriously his powers and he will become the strongest by a great deal, having no problem in defeating Yamamoto.
Aizen can't even hope to become a perfect hybrid: he will reach almost his purpose with the hougyoku, but he will always be a bit lower than Ichigo (at full power, with all of his potential developed, of course).
Guys I don't know but it seems you don't realize how much important what happened in Ichigo vs Ulquiorra fight is. It's shown that Ichigo can't die, because he will be resurrected becoming Ichigonator, or something even stronger.
Becoming a hybrid does not make your powers limiteless. Both hollows and shinigamis have limits. When you become a hollow/shinigami, that new limit is added to the one you already have. Just making your limit higher, not limitless