|Likes:||Peacock, Hive, Leduc, Big Band, Ileum, Anti-Skullgirl program, Stanley|
|Dislikes:||Skullgirl, Skull Heart, Valentine|
|Voice Actor:||Liam O'Brien|
In Peacock's story mode, Dr. Avian sends her off to fight the Skullgirl, but calls her back when the Lab comes under attack. When Peacock returns, she finds a mortally wounded Dr. Avian who, before passing away, tells her that she is the only one who could possibly defeat the Skullgirl.
He also appears in Big Band's story mode in a similar fashion to Peacock's story, sending Big Band a distress call vociferating that Lab 8 is under attack. By the time Big Band arrives at the lab, the doctor has already been killed in the ambush. It is later revealed that Valentine killed Avian herself, and did so while Double kept Big Band busy by fighting him.