Board Thread:General Discussion/@comment-27464043-20151230192612/@comment-28278649-20180307053757

Technically, he's not. If that was the case, he'd arguably be considered the property of Helen Cho instead, since it was her technology that created him. Vibranium was merely a tool in his creation.

But even then, T'Challa wouldn't lay claim to a sentient being, especially one with the amount of individuality Vision has.