caleyndar
Aether is predictable in so far as you know he'll only act if someone threatens him or Phoenix.
Ari... will just bite a chuck out of your neck without any prompting, simply because he thinks it'd be funny to see your bleed everywhere.
So yes, Ari is probably more scary than Aether. >_>
Yes, very unpredictable...and he's a weird psycho who killed his own sister because she took Gryps attention away.
That and he'd do things just to see what happens and he'd get great enjoyment torturing you or seeing you die slowly.
Thus the scariness...
Aether is just obsessed with Phoenix and the obsession takes all his time and energy.
My favourite characters would probably be Gryps, Draco and Phoenix.