Do not touch the scars on his back or the area around it under any circumstances! They are extremely sensitive, so, if touched lightly, it might cause him disomfort or, if touched a bit harder, it might cause him pain or trigger Phantom pain.

His tail and horns are also quite sensitive, so grabbing or pulling them will cause great discomfort and, if done too hard, it'll cause pain.

Please understand that he can easily get overwhelmed. And, especially after his (forced) amputation of his wings, Inky has become quite enochlophobiac (since it was a large number of employees that helped Joey cut his wings off).

Surprise hugs are NOT the smartest things you can do. You want to surprise him with a hug? Yeah have fun getting scratched with inky claws that can actually get longer than their normal length, at least a second degree burn and getting whatever part of your body that was on his back (specifically his spine) pierced by sharp spikes
But if you let him know that you want to hug him then he'll be happy to oblige

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A last note concerning the third warning: if he's confronted to large crowds, there's a big chance that Inky might unconsciously use his auras. You don't wanna' have a burn or worse, a heart attack, do you?