Much like Sephiroth, Tifa's appearance in Kingdom Hearts is symbolic of Cloud's light, thus adding to the series' well-known ...

Yoko Shimomura, best known for her work on the 'Kingdom Hearts' series, will be honoured with the BAFTA Fellowship on 8 April ...

That said, there's no reason why Cloud and Sephiroth can't make an appearance in Kingdom Hearts 4, especially since they completely vanished at the end of Kingdom Hearts 2.