Large stature, red skin
Demons (鬼) are a currently unseen species in BlazBlue.
Although unseen, demons have been fought against by the likes of Hakumen at some point before the events of BlazBlue: Calamity Trigger.  The only details about their appearance is that they are large and bright red.
Iron Tager was injected with demon cells (
Demons seemingly inhabit the Orient, as their cells have been found there, and there are Oriental stories surrounding them.
BlazBlue: Central Fiction Library Entry
- Demon Cells
Mysterious cells discovered in the Orient, transplanted into Tager. They were the subject of Kokonoe's research, but details are still unknown. What is known is that whoever they are transplanted into lose their former appearance. 
- BlazBlue: Calamity Trigger, Hakumen's story - -Lies and Truth-
- BlazBlue Material Collection, Iron Tager Short Story - Trust You
- BlazBlue: Central Fiction, Library Mode, Item #012