I don’t quite understand this question. How can such fictional characters appear in Ka`bah? Perhaps one is talking about a cartoon depicting such a thing.
It is wrong to do so as it amounts to doing irreverence. As Muslims we ought to reverence the symbols of Allah and Ka`bah is one of the greatest symbols.
Allah Almighty knows best.
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Views expressed by hosts/guests on this program (live dialogue, Facebook sessions, etc.) are their own and their appearance on the program does not imply an endorsement of them or any entity they represent.