The British actor will play the son of T'Challa, king of Wakanda, in the third movie in the series.
A number of guests said they would be reluctant to appear at conventions again after cases of recordings taking place without their knowledge.
A caped crusader is stopped at a railway station as they head to a Comic Con event.
The Geek Experience at Trinity Market will return for its fourth year from 10:00 until 16:00 BST.
The BBC's Mel Ramsay meets fans and actors at Liverpool Comic Con.
The Midlands Comic Con event features stars from films including Police Academy and Terminator 2.
Pictures and videos taken at the Film and Comic Con event at the Braehead Arena showed water seeping through floor coverings.
Organisers say the event in Bridlington will be a celebration of superheroes, sci-fi and creatives.
Music on a theme of betrayal at the Royal Albert Hall, the reality show that could become your new obsession, and Comic Con hits Manchester.
