10 strongest char bleach

1.ichigo with his hollow - He almost beat out several captains even though he was untrained and not their level
2.ichigo's dad - What else could produce a son like Ichigo? hehe a STRONG one!
4.Aizen - Unrestricted in his quest for power, very intelligent. and highly trained. His counter attacks doesn't involve him moving at all! hehehe
5.Byakuya - His composure in battle is a big plus! And he also has a mastered Bankai!
6.Yourichi/Urahara - Tied because they always end up together, I think they are a bit rusty and old though Yourichi is a great fighter! strong and fast! Urahara is an excellent teacher to Ichigo! Technical expert and also hands-on in his battles!
7.Kenpachi - His reautsu is so strong that he doesn't even need Bankai! Maybe he doesn't need it?
8. Ichimaru - Also the silent but deadly type :P
9. Hitsugaya - A bit one-trick pony in his style of attacks, maybe if he has more variety he'll be higher up in the scale.
10. Renji - A VC who has achieved Bankai! That's quite rare! Also he has mastered some Kidou attacks as well

Runner ups :
Soi Fon - Great physical fighter, my only complain is the sword (It has very limited range! and allows little room for misses)
Orihime - Could be strong but needs to control her emotions and understand her powers more!