Well there's a Naruto one, might as well add the other big show on.

http://www.fanfiction.net/s/2875726/1/Frozen_Sky

Hitsugaya's life and what it really takes to achieve Shikai and Bankai. Writing style can only be described as epic. Though it seems to be old and discontinued it's still one of the best Bleach fics out there.

http://www.fanfiction.net/s/2879915/1/Facets

A companion fic to Frozen Sky.

 

Why not?

This is a good one. Probably my favorite.

 

At least have some imagination.

http://forums.darklordpotter.net/showthread.php?t=7050

 

Shame, seems there really aren't that many good bleach fics after all.

 

Dry Heat » reviews
When Histugaya is rescued from imprisonment in Hueco Mundo, Zaraki takes it upons himself to cure him. HinaAizen, implied RanRen, ZarakixUnohana. But actually,very little romance. Lots and lots and lots of violence. Oh, and language. Please take care.
Complete - Bleach - Fiction Rated: T - English - Adventure/Horror - Chapters: 5 - Words: 10,778 - Reviews: 61 - Updated: 5-10-07 - Published: 5-7-07

Cold Rain » reviews
Sequel to Dry Heat. Aizen proposes an exchange of prisoners of war. Hitsugaya unwillingly starts to remember his past. Nothing is what it seems, and everyone must choose a side. Violence, language. IchiRuki. Slight RanRen, UnoKen. Not a lot of romance
Complete - Bleach - Fiction Rated: T - English - Adventure/Angst - Chapters: 10 - Words: 33,232 - Reviews: 168 - Updated: 7-9-07 - Published: 5-23-07

Green Blade » reviews
Sequel to Cold Rain. Hitsugaya, Yachiru, Ichigo and Rukia set out to find Hinamori. But in the shadowy lands of war and intrigue, they might lose themselves instead.
Bleach - Fiction Rated: T - English - Adventure/Drama - Chapters: 2 - Words: 3,212 - Reviews: 38 - Updated: 11-22-07 - Published: 11-19-07

Link: http://www.fanfiction.net/u/1263225/altersuperego

These fics are very good, with intense characterization, nice conflict. The battles are epic, especially in the second fic; this series is one of the rare ones actually describing a war with Aizen.

Finally, there are some scenes that leave one shivering, such as Aizen's reaction to the failure of his invasion in act two.

4/5 for the first fic

4.8/5 for the second

A sample of his writing style is here of Yachiru's shikai: