in zelda64 is there a gs where you can be an arwing

No, but there's a code to turn an object into an arwing. Use the search function at the top of this board to find it

You probably can. There's a code that allows you to play as Dark Link. But then again, Dark Link has very advanced AI.

Here's the code for the Airwing by the way:
81244096 0009
81244124 013B
81244132 0000

You should be child Link in Kokiri Forest.

(Code from Cendamos and JayTheHam)