User blog comment:Mrlmm0605/Let's Talk Bleach! - Part 13: Bankai/@comment-11446176-20160418015621

Thing about "small frame" bankai's, Ichigo's is - up to Kenpachi - the only one which is literally smaller in Bankai form than in Shikai form.

One could argue his outfit is part of his Bankai, as is Kenpachi's new look, but Ichi doesn't get any known advantage from his new robes, other than looking cool, unlike Kenchan's blood thirst/madness/not so looking cool.

Still pretty unique there