The Astral Plane is the realm of the demonrace, also known as Mazoku.
Every dragonlike creature should think twice before entering because Chaos is everywhere and waiting for mindless winged lizards to cross its paths.

Since not many humans are yet capable of entering the Astral Plane but it still tends to happen every now and then they too shall be warned, because Chaos makes no difference between lizard or human... If you wish to life... Keep out. It won't be healthy for you...

currently known Mazoku:

Zetsubo
Priest - Iron Anne Kidd
General - Reno_of_the_turks

TakekawaYumi
Sora7
sug chan
Diem Wind
Kikara Kaiba
Recca Hoshin
XelFan
Shuzuko
Midori-chan
Hakkai Iruka
Ty Ty (has joined the mazoku)
Levallia