Here are some "extra" AAU-based works done by Half-Elf. They feature AAU characters, though most of these do not appear in the manga itself. Enjoy!
"AAU Vid"
NOTE: When viewed, the timing on this video is usually off considerably. We appologize.
"Simpler Days"

The "Chapter 3: The Way of the Warrior" title page in full color! A flashback scene of Rin, Ai, and Jiro walking to school.
"The AAU Crew" 
A gag pic of Rin, Ryo, and Taro dressed as stereotypical Japanese gang members.
"Dai-nii"

A twelve-year-old Rin is comforted by her big brother.
"Ryo...Being Ryo..."

Ryo boasts that "it'll take more than that to stop [him]" after being injured in a fight.
"Cherry Blossoms"

Rin, Ryo, and Taro at a cherry blossom viewing party.
"A Warrior's Blade"

Ryo's sword, easily identified by the red cloth tied to the blade just below the cross guard.
"First Day of School"

Ryo wonders why Rin is so happy about the first day of school.
"Brother-in-Arms"

Ryo and Taro argue a lot, but in the end, they have each other's backs.
"The Order of the Senshi"

From left to right: Yoshimaru, Ryo, Rin, Taro, "inknown".
AAU Poster

An Angels Among Us poster!! It features 22 main and secondary characters.
Free Falling

The "Chapter 4: Secrets in the Dark" title page in full color.